• Экзамен / Домашнее задание

  • Экзамен / Домашнее задание

    • 26. - 1. Февраль

      Класс:
      Тип:
      • Пн26. 01.
      • 10-A
        ·
        Назначено домашнее задание
        Computer Science
        :
        HTML code for the Personal website
      • 10-A
        ·
        Назначено домашнее задание
        Инсандык онугуу
        :
        кластер
      • 10-A, 10-C FIZ-MAT
        ·
        домашнее задание
        Physics
        :
        Electromagnet and its core 1a. What is the purpose of the core in an electromagnet? Answer: The core increases the strength of the magnetic field produced by the coil by concentrating and enhancing the magnetic flux. ________________________________________ 1b. Why is iron a better core material than steel? Answer: Iron is magnetised and demagnetised easily, so it makes a strong temporary magnet. Steel is harder to demagnetise and would remain magnetised when the current is switched off. ________________________________________ 1c. Give two ways of increasing the strength of an electromagnet. Answer: • Increase the current through the coil • Increase the number of turns on the coil (Other acceptable answers: use a soft iron core) ________________________________________ 2. Relay controlling a motor 2a. What is the advantage of using a relay instead of a switch in the motor circuit? Answer: A relay allows a small current to safely control a circuit with a much larger current, protecting the switch and the user. ________________________________________ 2b. Why does the motor start when switch S is closed? Answer: Closing switch S allows current to flow through the relay coil, creating a magnetic field that closes the relay contacts. This completes the motor circuit, allowing current to flow through the motor. ________________________________________ 3. Circuit breaker 3a. What is the purpose of a circuit breaker? Answer: A circuit breaker protects the circuit by switching off the current automatically if it becomes too large. ________________________________________ 3b. How would the performance change if the electromagnet coil had more turns? Answer: The electromagnet would be stronger, so the circuit breaker would trip at a lower current. ________________________________________ 4. Magnetic tape recording 4a. Why is an electromagnet needed to record sound on tape? Answer: The electromagnet produces a changing magnetic field that magnetises the tape in patterns corresponding to the sound signal. ________________________________________ 4b. Why must the tape coating be between soft and hard magnetically? Answer: It must be hard enough to retain the magnetic pattern, but soft enough to be re-magnetised when recording new sounds. /////////////////////////////////////////////////////////////////////////// Lesson 5 Magnetic Force on a Current 1. What happens to a current-carrying conductor in a magnetic field? Answer: A current-carrying conductor placed in a magnetic field experiences a force. ________________________________________ 2. Why is there a force on a current-carrying wire in a magnetic field? Answer: The current produces its own magnetic field, which interacts with the magnetic field of the magnet, resulting in a force on the wire. ________________________________________ 3. Does a stationary copper wire experience a force in a magnetic field? Answer: No. Copper is non-magnetic, so it only experiences a force when a current flows through it. ________________________________________ 4. How does the wire move in the magnetic field? Answer: The wire moves across the magnetic field, not towards either pole. ________________________________________ 5. What happens if the direction of the current or the magnetic field is reversed? Answer: The direction of the force on the wire is reversed. ________________________________________ 6. What factors increase the force on the wire? Answer: The force is increased by: • Increasing the current • Using a stronger magnetic field • Increasing the length of wire in the magnetic field ________________________________________ Magnetic Fields and Forces 7. What are the rules for magnetic poles? Answer: Like poles repel; unlike poles attract. ________________________________________ 8. What do magnetic field lines represent? Answer: They show the direction in which a north pole would experience a force. ________________________________________ 9. What magnetic field is produced by a straight current-carrying wire? Answer: A circular magnetic field around the wire. ________________________________________ 10. Why does the wire get pushed when placed between magnet poles? Answer: The magnetic fields combine and distort, producing a force that pushes the wire. ________________________________________ Fleming’s Left-Hand Rule 11. What is Fleming’s left-hand rule used for? Answer: It is used to predict the direction of the force on a current-carrying conductor in a magnetic field. ________________________________________ 12. How do you use Fleming’s left-hand rule? Answer: Hold the thumb, first finger, and second finger of the left hand at right angles: • First finger: magnetic field direction (N to S) • Second finger: current direction (+ to −) • Thumb: force (motion) direction ________________________________________ 13. What conditions are required for Fleming’s left-hand rule to apply? Answer: The current and magnetic field must be at right angles. ________________________________________ 14. What happens if the current and field are parallel? Answer: There is no force on the conductor. ________________________________________ Charged Particles in Magnetic Fields 15. What happens to a beam of charged particles in a magnetic field? Answer: It experiences a force, just like a current in a wire. ________________________________________ Applications 16. How does a moving-coil loudspeaker work? Answer: An alternating current flows through a coil in a magnetic field, causing the coil to move backwards and forwards. This makes the cone vibrate and produce sound waves. ________________________________________ 17. Why does the loudspeaker cone vibrate? Answer: Because the direction of the current (and force) continually changes with alternating current. ________________________________________ 18. What causes a turning effect on a current-carrying coil in a magnetic field? Answer: Opposite forces act on opposite sides of the coil, causing it to rotate. ________________________________________ 19. How can the turning effect on a coil be increased? Answer: By increasing the number of turns on the coil. ________________________________________ 20. How does a moving-coil meter work? Answer: The current causes the coil to turn in a magnetic field. The greater the current, the greater the turning effect, and the further the pointer moves. ________________________________________ If you want, I can also shorten this into exam-mark answers, add labelled diagrams, or turn it into flashcards. 1 There is a force on the wire in the diagram on the right. a Give two ways in which the force could be increased. ⑥ Use Fleming's left-hand rule to work out the direction of the force. c Give two ways in which the direction of the force could be reversed. 2 Explain why the cone of a loudspeaker vibrates when alternating current passes through its coil. 3 The diagram above shows a current-carrying coil in a magnetic field. What difference would it make if a there were more turns of wire in the coil b the direction of the current were reversed? Give Answers Here are clear, exam-style answers to each question. ________________________________________ 1 Force on a current-carrying wire 1a. Give two ways in which the force could be increased. Answer: • Increase the current in the wire • Use a stronger magnetic field (Also acceptable: increase the length of wire in the magnetic field) ________________________________________ 1b. Use Fleming’s left-hand rule to work out the direction of the force. Answer: Using Fleming’s left-hand rule, with the first finger pointing from N to S (field direction) and the second finger pointing in the direction of the current, the thumb shows the direction of the force on the wire. ________________________________________ 1c. Give two ways in which the direction of the force could be reversed. Answer: • Reverse the direction of the current • Reverse the direction of the magnetic field (swap the magnet poles) ________________________________________ 2 Loudspeaker 2. Explain why the cone of a loudspeaker vibrates when alternating current passes through its coil. Answer: Alternating current continually changes direction in the coil. This causes the magnetic force on the coil to change direction, making the coil move backwards and forwards. The coil is attached to the cone, so the cone vibrates and produces sound waves. ________________________________________ 3 Current-carrying coil in a magnetic field 3a. What difference would it make if there were more turns of wire in the coil? Answer: The turning effect would be greater, so the coil would rotate more strongly. ________________________________________ 3b. What difference would it make if the direction of the current were reversed? Answer: The direction of rotation of the coil would be reversed.
      • 10-B
        ·
        Назначено домашнее задание
        Computer Science
        :
        HTML code for the Personal website
      • 10-B
        ·
        домашнее задание
        Russian Literature
        :
        Знать сюжет,тему,идею и героев романа; опереж.зад. роман «Идиот»
      • 10-C
        ·
        Назначено домашнее задание
        Geography
        :
        т.1
      • 11-A
        ·
        Назначено домашнее задание
        Computer Science
        :
        Make a presentation for the Database and Project Idea
      • 11-A KG
        ·
        Назначено домашнее задание
        History
        :
        Параграф 5. Кыргызстандагы улуттук-боштондук күрөш.
      • 11-B RU
        ·
        домашнее задание
        Russian Literature
        :
        знать историю создания, сюжет, тему и героев ; опереж. зад. подготовить презентацию по теме :М. Булгаков. Роман «Мастер и Маргарита»,
      • 11-D, 11-B, 11-A KG
        ·
        домашнее задание
        Kyrgyz Language
        :
        "Сынган кылыч" романынан диалектилик 30 сөздү адабий тилдеги аталышы менен жазып келүү.
      • 7-A
        ·
        Назначено домашнее задание
        Computer Science
        :
        1. CV IN MS WORD 2. Chapter 13 Layout Summary 3. Chapter 14 Styles Summary
      • 7-A
        ·
        домашнее задание
        Mathematics
        :
        CB and WB Ex 7.2
      • 7-A
        ·
        домашнее задание
        Russian Language
        :
        Подготовка к зачёту
      • 7-B
        ·
        домашнее задание
        Mathematics
        :
        CB Ex 7.2
      • 7-B
        ·
        домашнее задание
        Russian Language
        :
        Стр.123 упр 203
      • 7-С
        ·
        Назначено домашнее задание
        Computer Science
        :
        1. CV IN MS WORD 2. Chapter 13 Layout Summary 3. Chapter 14 Styles Summary
      • 7-С
        ·
        домашнее задание
        History
        :
        Параграф 30. ГОСУДАРСТВО ХАЙДУ.
      • 7-С
        ·
        домашнее задание
        Russian Literature
        :
        Написать мини-сочинение: «Почему рассказ “Репетитор” остаётся актуальным?»
      • 7-С
        ·
        домашнее задание
        Turkish Language
        :
        Pazartesi gününe kadar kelimeleri ezberleyelim. 26. Ocağa kadar.
      • 8-A
        ·
        домашнее задание
        Physics
        :
        colour of paint. wave and particle theory of light. eyae andcamera.
      • 8-B
        ·
        Назначено домашнее задание
        Kyrgyz Literature
        :
        Окуп келүү
      • 8-B
        ·
        Назначено домашнее задание
        Kyrgyz Literature
        :
        Ч.Айтматов "Эрте келген турналар"
      • 8-C
        ·
        домашнее задание
        Kyrgyz Language
        :
        2-көнүгүү
      • 8-C
        ·
        Назначено домашнее задание
        Инсандык онугуу
        :
        эссе
      • 8-D
        ·
        Назначено домашнее задание
        Computer Science
        :
        1. CV IN MS WORD 2. Chapter 13 Layout Summary 3. Chapter 14 Styles Summary
      • 8-D
        ·
        домашнее задание
        History
        :
        Глава 2. Освободительная борьба народов Восточного Тенир-Тоо против маньчжурского цинского господства. Параграф 4. Усиление гнета местного населения цинскими правителями.
      • 9-C
        ·
        домашнее задание
        Kyrgyz Literature
        :
        "Кемчонтой " чыгармасын окуп ,5 суроо түзүү.Калык Акиев "Баскан жол" чыгармасын окуу,түшүнүксүз сөздөрдү жазып келүү.
      • 9-C
        ·
        Назначено домашнее задание
        Kyrgyz Literature
        :
        "Насыят "ырын жаттап келүү
      • 9-D
        ·
        домашнее задание
        Russian Literature
        :
        Выучить стих-е " Керн"
      • 9-D
        ·
        Назначено домашнее задание
        Инсандык онугуу
        :
        кластер
      • Вт27. 01.
      • 10-A
        ·
        домашнее задание
        Russian Language
        :
        Трениров.упр
      • 10-B
        ·
        домашнее задание
        Kyrgyz Language
        :
        213-көнүгүү,багыныңкы сүйлөмдордү жазуу.Текст боюнча 6 суроо түзүү.
      • 10-B
        ·
        домашнее задание
        Russian Literature
        :
        1.Мини-эссе: «Почему князь Мышкин — трагический герой?» 2. Таблица: «Черты идеального человека и реальная жизнь». 3. Мини-исследование: Актуален ли роман «Идиот» в XXI веке?
      • 10-B FIZ-MAT
        ·
        домашнее задание
        Physics
        :
        Fleming’s Left-Hand Rule 11. What is Fleming’s left-hand rule used for? Answer: It is used to predict the direction of the force on a current-carrying conductor in a magnetic field. ________________________________________ 12. How do you use Fleming’s left-hand rule? Answer: Hold the thumb, first finger, and second finger of the left hand at right angles: • First finger: magnetic field direction (N to S) • Second finger: current direction (+ to −) • Thumb: force (motion) direction ________________________________________ 13. What conditions are required for Fleming’s left-hand rule to apply? Answer: The current and magnetic field must be at right angles. ________________________________________ 14. What happens if the current and field are parallel? Answer: There is no force on the conductor. ________________________________________ Charged Particles in Magnetic Fields 15. What happens to a beam of charged particles in a magnetic field? Answer: It experiences a force, just like a current in a wire. ________________________________________ Applications 16. How does a moving-coil loudspeaker work? Answer: An alternating current flows through a coil in a magnetic field, causing the coil to move backwards and forwards. This makes the cone vibrate and produce sound waves. ________________________________________ 17. Why does the loudspeaker cone vibrate? Answer: Because the direction of the current (and force) continually changes with alternating current. ________________________________________ 18. What causes a turning effect on a current-carrying coil in a magnetic field? Answer: Opposite forces act on opposite sides of the coil, causing it to rotate. ________________________________________ 19. How can the turning effect on a coil be increased? Answer: By increasing the number of turns on the coil. ________________________________________ 20. How does a moving-coil meter work? Answer: The current causes the coil to turn in a magnetic field. The greater the current, the greater the turning effect, and the further the pointer moves. ________________________________________ 1 Force on a current-carrying wire 1a. Give two ways in which the force could be increased. Answer: • Increase the current in the wire • Use a stronger magnetic field (Also acceptable: increase the length of wire in the magnetic field) ________________________________________ 1b. Use Fleming’s left-hand rule to work out the direction of the force. Answer: Using Fleming’s left-hand rule, with the first finger pointing from N to S (field direction) and the second finger pointing in the direction of the current, the thumb shows the direction of the force on the wire. ________________________________________ 1c. Give two ways in which the direction of the force could be reversed. Answer: • Reverse the direction of the current • Reverse the direction of the magnetic field (swap the magnet poles) ________________________________________ 2 Loudspeaker 2. Explain why the cone of a loudspeaker vibrates when alternating current passes through its coil. Answer: Alternating current continually changes direction in the coil. This causes the magnetic force on the coil to change direction, making the coil move backwards and forwards. The coil is attached to the cone, so the cone vibrates and produces sound waves. ________________________________________ 3 Current-carrying coil in a magnetic field 3a. What difference would it make if there were more turns of wire in the coil? Answer: The turning effect would be greater, so the coil would rotate more strongly. ________________________________________ 3b. What difference would it make if the direction of the current were reversed? Answer: The direction of rotation of the coil would be reversed.
      • 10-C
        ·
        домашнее задание
        Kyrgyz Language
        :
        213-көнүгүү,багыныңкы сүйлөмдордү жазуу.Текст боюнча 6 суроо түзүү.
      • 11-A KG
        ·
        Назначено домашнее задание
        Human and Society
        :
        Үй тапшырма жок.
      • 11-B
        ·
        домашнее задание
        Mathematics
        :
        page 51 ex [1-3] and page 58 ex 1-2
      • 11-B
        ·
        домашнее задание
        Physics
        :
        What is resistance? Answer: Resistance is a measure of how difficult it is for electric current to flow through a component. It is caused by collisions between charge carriers and the atoms (positive ions) in the material. ________________________________________ 2. What is the unit of resistance? Answer: The unit of resistance is the ohm (Ω). 1 ohm = 1 volt per ampere (1 Ω = 1 V/A). ________________________________________ 3. How is resistance calculated? Answer: Resistance is calculated using the formula: R=VIR = \frac{V}{I}R=IV where: • RRR = resistance (Ω) • VVV = potential difference (V) • III = current (A) ________________________________________ 4. What is Ohm’s Law? Answer: Ohm’s Law states that the current through a conductor is directly proportional to the potential difference across it, provided the temperature is constant. ________________________________________ 5. What equations come from Ohm’s Law? Answer: V=IRandI=VRV = IR \quad \text{and} \quad I = \frac{V}{R}V=IRandI=RV ________________________________________ 6. What are I–V characteristics? Answer: I–V characteristics show how current changes with voltage for a component. • Metallic conductor (constant temperature): Straight line through the origin • Filament lamp: Curved line (resistance increases as temperature rises) • Semiconductor diode: Current flows easily in one direction only ________________________________________ 7. What is the formula for resistivity? Answer: R=ρLAR = \rho \frac{L}{A}R=ρAL where: • ρ\rhoρ = resistivity of the material • LLL = length • AAA = cross-sectional area ________________________________________ 8. Worked Example – Part (a) Question: The current through a component is 2.0 mA when the p.d. is 12 V. What is its resistance? Answer: R=VI=122.0×10−3=6000 ΩR = \frac{V}{I} = \frac{12}{2.0 \times 10^{-3}} = 6000 \, \OmegaR=IV=2.0×10−312=6000Ω ________________________________________ 9. Worked Example – Part (b) Question: What is the p.d. when the current is 50 μA, assuming resistance is unchanged? Answer: V=IR=(50×10−6)×6000=0.3 VV = IR = (50 \times 10^{-6}) \times 6000 = 0.3 \, VV=IR=(50×10−6)×6000=0.3V What is a resistor? Answer: A resistor is a component designed to have a fixed resistance that remains the same regardless of the current flowing through it. ________________________________________ 2. How can the resistance of a resistor be measured? Answer: The resistance can be measured using a circuit that includes a resistor, an ammeter in series, and a voltmeter in parallel. ________________________________________ 3. What is the purpose of the ammeter in the circuit? Answer: The ammeter measures the current flowing through the resistor. ________________________________________ 4. Why must the ammeter be connected in series with the resistor? Answer: It must be in series so that the same current flows through both the ammeter and the resistor. ________________________________________ 5. What is the purpose of the voltmeter in the circuit? Answer: The voltmeter measures the potential difference (p.d.) across the resistor. ________________________________________ 6. Why must the voltmeter be connected in parallel with the resistor? Answer: It must be in parallel so that the voltmeter and the resistor have the same potential difference across them. ________________________________________ 7. Why should no current pass through the voltmeter? Answer: If current flows through the voltmeter, the ammeter will not measure the exact current in the resistor. ________________________________________ 8. What resistance should a voltmeter ideally have? Answer: In theory, a voltmeter should have infinite resistance. In practice, a very high resistance is sufficient. ________________________________________ 9. What is the purpose of the variable resistor? Answer: The variable resistor is used to adjust the current and potential difference in the circuit. ________________________________________ 10. How is the relationship between current and p.d. investigated? Answer: The variable resistor is adjusted in steps. At each step, the current and potential difference are recorded. ________________________________________ 11. How are the results displayed? Answer: The measurements are plotted on a graph of potential difference (p.d.) against current. ________________________________________ 12. What does a straight-line p.d.–current graph show? Answer: A straight-line graph shows that the resistor obeys Ohm’s Law and has constant resistance. Ohm’s Law 1. What does the I–V graph for a resistor look like? Answer: It is a straight line through the origin. ________________________________________ 2. What does a straight-line I–V graph show about resistance? Answer: It shows that the resistance is constant and does not change with current. ________________________________________ 3. Why is the resistance equal to the gradient of the V–I graph? Answer: Because the gradient is equal to potential difference divided by current (V/IV/IV/I), which is the definition of resistance. ________________________________________ 4. Who discovered Ohm’s Law and when? Answer: Ohm’s Law was discovered by Georg Ohm in 1826. ________________________________________ 5. State Ohm’s Law. Answer: Ohm’s Law states that the potential difference across a metallic conductor is proportional to the current through it, provided the physical conditions (such as temperature) remain constant. ________________________________________ 6. What does Ohm’s Law say about resistance? Answer: It states that the resistance of a metallic conductor is constant when physical conditions are unchanged. ________________________________________ 7. What equation applies to an ohmic conductor? Answer: V=IRV = IRV=IR where RRR is constant. ________________________________________ Resistivity 8. What is resistivity? Answer: Resistivity is a property of a material that indicates how strongly it resists the flow of electric current. ________________________________________ 9. How does resistance depend on the length of a conductor? Answer: Resistance is directly proportional to the length LLL of the conductor. ________________________________________ 10. How does resistance depend on cross-sectional area? Answer: Resistance is inversely proportional to the cross-sectional area AAA. ________________________________________ 11. What is the formula relating resistance, length, area, and resistivity? Answer: R=ρLAR = \rho \frac{L}{A}R=ρAL ________________________________________ 12. What does the symbol ρ\rhoρ represent? Answer: ρ\rhoρ represents the resistivity of the material. ________________________________________ 13. How can resistivity be calculated from resistance? Answer: By rearranging the formula: ρ=RAL\rho = \frac{RA}{L}ρ=LR
      • 11-B
        ·
        домашнее задание
        Physics
        :
        What is resistance? Answer: Resistance is a measure of how difficult it is for electric current to flow through a component. It is caused by collisions between charge carriers and the atoms (positive ions) in the material. ________________________________________ 2. What is the unit of resistance? Answer: The unit of resistance is the ohm (Ω). 1 ohm = 1 volt per ampere (1 Ω = 1 V/A). ________________________________________ 3. How is resistance calculated? Answer: Resistance is calculated using the formula: R=VIR = \frac{V}{I}R=IV where: • RRR = resistance (Ω) • VVV = potential difference (V) • III = current (A) ________________________________________ 4. What is Ohm’s Law? Answer: Ohm’s Law states that the current through a conductor is directly proportional to the potential difference across it, provided the temperature is constant. ________________________________________ 5. What equations come from Ohm’s Law? Answer: V=IRandI=VRV = IR \quad \text{and} \quad I = \frac{V}{R}V=IRandI=RV ________________________________________ 6. What are I–V characteristics? Answer: I–V characteristics show how current changes with voltage for a component. • Metallic conductor (constant temperature): Straight line through the origin • Filament lamp: Curved line (resistance increases as temperature rises) • Semiconductor diode: Current flows easily in one direction only ________________________________________ 7. What is the formula for resistivity? Answer: R=ρLAR = \rho \frac{L}{A}R=ρAL where: • ρ\rhoρ = resistivity of the material • LLL = length • AAA = cross-sectional area ________________________________________ 8. Worked Example – Part (a) Question: The current through a component is 2.0 mA when the p.d. is 12 V. What is its resistance? Answer: R=VI=122.0×10−3=6000 ΩR = \frac{V}{I} = \frac{12}{2.0 \times 10^{-3}} = 6000 \, \OmegaR=IV=2.0×10−312=6000Ω ________________________________________ 9. Worked Example – Part (b) Question: What is the p.d. when the current is 50 μA, assuming resistance is unchanged? Answer: V=IR=(50×10−6)×6000=0.3 VV = IR = (50 \times 10^{-6}) \times 6000 = 0.3 \, VV=IR=(50×10−6)×6000=0.3V What is a resistor? Answer: A resistor is a component designed to have a fixed resistance that remains the same regardless of the current flowing through it. ________________________________________ 2. How can the resistance of a resistor be measured? Answer: The resistance can be measured using a circuit that includes a resistor, an ammeter in series, and a voltmeter in parallel. ________________________________________ 3. What is the purpose of the ammeter in the circuit? Answer: The ammeter measures the current flowing through the resistor. ________________________________________ 4. Why must the ammeter be connected in series with the resistor? Answer: It must be in series so that the same current flows through both the ammeter and the resistor. ________________________________________ 5. What is the purpose of the voltmeter in the circuit? Answer: The voltmeter measures the potential difference (p.d.) across the resistor. ________________________________________ 6. Why must the voltmeter be connected in parallel with the resistor? Answer: It must be in parallel so that the voltmeter and the resistor have the same potential difference across them. ________________________________________ 7. Why should no current pass through the voltmeter? Answer: If current flows through the voltmeter, the ammeter will not measure the exact current in the resistor. ________________________________________ 8. What resistance should a voltmeter ideally have? Answer: In theory, a voltmeter should have infinite resistance. In practice, a very high resistance is sufficient. ________________________________________ 9. What is the purpose of the variable resistor? Answer: The variable resistor is used to adjust the current and potential difference in the circuit. ________________________________________ 10. How is the relationship between current and p.d. investigated? Answer: The variable resistor is adjusted in steps. At each step, the current and potential difference are recorded. ________________________________________ 11. How are the results displayed? Answer: The measurements are plotted on a graph of potential difference (p.d.) against current. ________________________________________ 12. What does a straight-line p.d.–current graph show? Answer: A straight-line graph shows that the resistor obeys Ohm’s Law and has constant resistance. Ohm’s Law 1. What does the I–V graph for a resistor look like? Answer: It is a straight line through the origin. ________________________________________ 2. What does a straight-line I–V graph show about resistance? Answer: It shows that the resistance is constant and does not change with current. ________________________________________ 3. Why is the resistance equal to the gradient of the V–I graph? Answer: Because the gradient is equal to potential difference divided by current (V/IV/IV/I), which is the definition of resistance. ________________________________________ 4. Who discovered Ohm’s Law and when? Answer: Ohm’s Law was discovered by Georg Ohm in 1826. ________________________________________ 5. State Ohm’s Law. Answer: Ohm’s Law states that the potential difference across a metallic conductor is proportional to the current through it, provided the physical conditions (such as temperature) remain constant. ________________________________________ 6. What does Ohm’s Law say about resistance? Answer: It states that the resistance of a metallic conductor is constant when physical conditions are unchanged. ________________________________________ 7. What equation applies to an ohmic conductor? Answer: V=IRV = IRV=IR where RRR is constant. ________________________________________ Resistivity 8. What is resistivity? Answer: Resistivity is a property of a material that indicates how strongly it resists the flow of electric current. ________________________________________ 9. How does resistance depend on the length of a conductor? Answer: Resistance is directly proportional to the length LLL of the conductor. ________________________________________ 10. How does resistance depend on cross-sectional area? Answer: Resistance is inversely proportional to the cross-sectional area AAA. ________________________________________ 11. What is the formula relating resistance, length, area, and resistivity? Answer: R=ρLAR = \rho \frac{L}{A}R=ρAL ________________________________________ 12. What does the symbol ρ\rhoρ represent? Answer: ρ\rhoρ represents the resistivity of the material. ________________________________________ 13. How can resistivity be calculated from resistance? Answer: By rearranging the formula: ρ=RAL\rho = \frac{RA}{L}ρ=LR
      • 11-C
        ·
        домашнее задание
        Physics
        :
        Electromotive Force (e.m.f.) Q4. What is electromotive force (e.m.f.)? A. e.m.f. is the electrical energy supplied per unit charge by a source. Q5. What is the unit of e.m.f.? A. The unit is the volt (V). Q6. What does one volt mean? A. 1 volt = 1 joule per coulomb (1 J/C). Q7. How much energy is produced when charge Q passes through a source of e.m.f. E? A. The energy produced is E × Q. ________________________________________ Power in Electric Circuits Q8. What is electrical power? A. Power is the rate of energy transfer in a circuit. Q9. What is the unit of power? A. The unit is the watt (W). Q10. What is the formula for electrical power? A. P = IV, where • P = power • I = current • V = voltage Q11. How are volts, watts, and amps related? A. 1 volt = 1 watt per ampere (1 W/A). ________________________________________ Electrical Energy and kWh Q12. How is electrical energy from the mains measured? A. In kilowatt-hours (kWh), also called “units”. Q13. What is 1 kilowatt-hour? A. The energy used when 1 kW of power is supplied for 1 hour. Q14. How many joules are in 1 kWh? A. 1 kWh = 3.6 MJ (3.6 million joules). ________________________________________ Fuses and Current Q15. How do you calculate the current for an appliance? A. Use the formula I = P / V. Q16. Why must the correct fuse be chosen? A. To allow normal current to flow but break the circuit if the current becomes too large. Q17. Why does a 2.5 kW, 230 V kettle need a 13 A fuse? A. Its current is about 11 A, so a 13 A fuse is suitable (5 A would be too small). ________________________________________ Worked Example Q18. What is the current in a 12 V, 48 W heater? A. I=P/V=48/12=4A Q19. How do you calculate energy transferred? A. Use Energy = Power × Time. 1. What is meant by electrical power? A. Electrical power is the rate at which electrical energy is transferred or work is done in a circuit. ________________________________________ Q2. What does the symbol V represent in an electrical component? A. V represents the potential difference (voltage) across the terminals of the component. ________________________________________ Q3. What does the symbol I represent? A. I represents the electric current flowing through the component. ________________________________________ Q4. How is the charge flowing through a component calculated? A. The charge Q is calculated using: Q=I/Δt where I is the current and Δt is the time. ________________________________________ Q5. How is the work done by charge carriers calculated? A. The work done W is given by: W=QV where Q is the charge and V is the potential difference. ________________________________________ Q6. How can work done be expressed in terms of current, voltage, and time? A. Since Q=IΔt W=IVΔt ________________________________________ Q7. What is the relationship between energy transferred and work done? A. The energy transferred in a component is equal to the work done by the charge carriers. ________________________________________ Q8. How is electrical power defined in terms of energy and time? A. Electrical power is energy transferred per unit time: P=Et ________________________________________ Q9. How is the formula for electrical power derived? A. Since E=W=IVΔt, dividing by time gives: P=IV ________________________________________ Q10. What is the formula for electrical power? A. P=IV
      • 11-C
        ·
        Назначено домашнее задание
        Russian Language
        :
        Базовый уровень: Выписать из художественного текста 5 предложений с обобщающим словом. Повышенный уровень: Написать мини-текст (5–6 предложений), используя разные позиции обобщающего слова
      • 11-C
        ·
        домашнее задание
        Russian Language
        :
        творческая часть (на выбор) Вариант А. Стилистика Составьте мини-текст (4–5 предложений) на тему «Школьные годы», используя: минимум два обобщающих слова; • разные позиции обобщающего слова (до и после однородных членов Вариант Б. Анализ Найдите в художественном произведении или публицистическом тексте 2 предложения с обобщающим словом. Выпишите их и: 1.подчеркните обобщающее слово; 2.объясните постановку знаков препинания; 3.укажите стилистическую роль.
      • 11-C
        ·
        домашнее задание
        Russian Literature
        :
        знать сюжет, тему и героев поэмы;. зад. подготовить презентацию по теме : М. Булгаков. Роман «Мастер и Маргарита»,
      • 11-D RU
        ·
        Назначено домашнее задание
        ОРТ РУССКИЙ ЯЗЫК
        :
        Подготовка к тесту,конспект
      • 11-D, 11-A RU
        ·
        Назначено домашнее задание
        Russian Language
        :
        Базовый уровень: Выписать из художественного текста 5 предложений с обобщающим словом. Повышенный уровень: Написать мини-текст (5–6 предложений), используя разные позиции обобщающего слова
      • 11-D, 11-A RU
        ·
        домашнее задание
        Russian Language
        :
        Творческая часть (на выбор) Вариант А. Стилистика Составьте мини-текст (4–5 предложений) на тему «Школьные годы», используя: минимум два обобщающих слова; • разные позиции обобщающего слова (до и после однородных членов Вариант Б. Анализ Найдите в художественном произведении или публицистическом тексте 2 предложения с обобщающим словом. Выпишите их и: 1.подчеркните обобщающее слово; 2.объясните постановку знаков препинания; 3.укажите стилистическую роль.
      • 7-A
        ·
        домашнее задание
        Mathematics
        :
        WB Ex 7.2
      • 7-B
        ·
        домашнее задание
        History
        :
        Параграф 30. ГОСУДАРСТВО ХАЙДУ.
      • 7-B
        ·
        Назначено домашнее задание
        Kyrgyz Literature
        :
        Таблицаны толтуруп, сүйлөмдү толуктап келгиле
      • 7-B
        ·
        домашнее задание
        Russian Language
        :
        Стр.125 упр 208
      • 7-С
        ·
        домашнее задание
        Kyrgyz Language
        :
        2-көнүгүү
      • 7-С
        ·
        Назначено домашнее задание
        Kyrgyz Language
        :
        Куштар боюнча кайталоо
      • 7-С
        ·
        домашнее задание
        Russian Language
        :
        Стр.123 упр 203
      • 7-С
        ·
        домашнее задание
        Turkish Language
        :
        Çalışma kitabı sayfa: 56-57 Kelimeleri ezberleyelim.
      • 8-A
        ·
        Назначено домашнее задание
        Russian Literature
        :
        Читать рассказ " Бежин луг"
      • 8-B
        ·
        домашнее задание
        History
        :
        Глава 2. Освободительная борьба народов Восточного Тенир-Тоо против маньчжурского цинского господства. Параграф 4. Усиление гнета местного населения цинскими правителями.
      • 8-B
        ·
        домашнее задание
        Kyrgyz Language
        :
        "Тоолордун көрүнбөгөн ээси"
      • 8-C
        ·
        домашнее задание
        English
        :
        повторение
      • 8-C
        ·
        домашнее задание
        Russian Literature
        :
        Творческое задание: письмо героине от имени читателя.
      • 8-D
        ·
        домашнее задание
        Mathematics
        :
        WB Ex 8.2
      • 9-A
        ·
        домашнее задание
        Kyrgyz Language
        :
        5 тбтс 5 ббтс
      • 9-A
        ·
        Назначено домашнее задание
        Russian Language
        :
        Повторение
      • 9-B
        ·
        домашнее задание
        Geography
        :
        презентация
      • 9-B
        ·
        Назначено домашнее задание
        Human and Society
        :
        Сочинение на тему: Влияние социальных сетей на моральные ценности молодежи
      • 9-C
        ·
        домашнее задание
        Geography
        :
        презентация
      • 9-C
        ·
        домашнее задание
        Physics
        :
        p = density. g . h
      • 9-D
        ·
        Назначено домашнее задание
        Geography
        :
        п.19
      • 9-D
        ·
        домашнее задание
        Geography
        :
        презентация
      • Ср28. 01.
      • 10-A
        ·
        Назначено домашнее задание
        Kyrgyz Language
        :
        12 суй ишке ашканга жаяр,жасалма,максатка
      • 10-A
        ·
        домашнее задание
        Kyrgyz Language
        :
        кызыктуу маалымат татаал этиштер менен
      • 10-A
        ·
        Назначено домашнее задание
        Russian Literature
        :
        Опережающее задание
      • 10-A
        ·
        домашнее задание
        Russian Literature
        :
        твор.работы
      • 10-B
        ·
        Назначено домашнее задание
        Russian Language
        :
        1. Проект: Составить «Этимологический кроссворд» по теме (минимум 15 слов). 2. Эссе: «Битва Е и Э: почему мы пишем "компьютер", но произносим [тэ]?» 3. Поиск: Найти в меню кафе или на вывесках города ошибки на изученные правила и принести фотоотчет.
      • 10-B
        ·
        домашнее задание
        Russian Language
        :
        «Творческий синтез» (Креативный) Задание для тех, кто лучше запоминает через контекст и практику. Задание: Составьте связный текст (8–10 предложений) на тему «Утро в лесу» или «Случай на вокзале». Условие: Обязательно используйте в тексте минимум 7 слов с разными типами чередования гласных (на смысл, на ударение, на суффикс, на согласную). Дополнительно: Графически обозначьте условия выбора гласной в этих словах. «Проектировщик ловушек» Задание на развитие «орфографической зоркости» и самопроверку. Задание: Составьте собственный тест в формате ЕГЭ по теме «Гласные в корне». Сформулируйте задание: «Укажите варианты ответов, в которых во всех словах одного ряда пропущена одна и та же буква». Составьте 5 рядов слов (по 3 слова в каждом). Включите в каждый ряд минимум одно слово с чередованием и одно слово-ловушку (с похожим корнем, но проверяемое). Приложите ключ (правильные ответы) с кратким пояснени
      • 10-B FIZ-MAT
        ·
        домашнее задание
        Physics
        :
        Electric Motors – Questions & Answers 1. What happens when a current-carrying coil is placed in a magnetic field? Answer: Forces act on the sides of the coil, producing a turning effect (rotation). ________________________________________ 2. Why do the forces on a current-carrying coil cause it to turn? Answer: The current flows in opposite directions on opposite sides of the coil, so the magnetic forces act in opposite directions, creating a turning moment. ________________________________________ 3. Which rule is used to find the direction of the force on the coil? Answer: Fleming’s left-hand rule. ________________________________________ 4. What is the purpose of the split-ring commutator? Answer: It reverses the direction of the current every half-turn, so the coil continues to rotate in the same direction. ________________________________________ 5. What do the brushes do in a simple d.c. motor? Answer: They connect the power supply to the rotating split-ring commutator and coil. ________________________________________ 6. Why would the coil stop turning without a commutator? Answer: Because the forces would bring the coil to rest in the vertical position, where the turning effect is zero. ________________________________________ 7. When is the turning effect on the coil maximum? Answer: When the coil is horizontal, because the forces are furthest apart and have maximum leverage. ________________________________________ 8. When is the turning effect on the coil zero? Answer: When the coil is vertical, because the forces act through the axis of rotation. ________________________________________ 9. How does the commutator keep the coil rotating continuously? Answer: As the coil passes the vertical position, the commutator reverses the current, reversing the forces and keeping the coil turning. ________________________________________ 10. What happens if the battery connections or magnet poles are reversed? Answer: The coil rotates in the opposite direction. ________________________________________ 11. Give four ways to increase the turning effect on a coil. Answer: • Increase the current • Use a stronger magnet • Increase the number of turns on the coil • Increase the area of the coil ________________________________________ 12. Why do practical motors use several coils instead of one? Answer: To produce a larger turning effect and smoother rotation. ________________________________________ 13. What is an armature? Answer: An iron core around which the coils are wound; it becomes magnetized and strengthens the magnetic field. ________________________________________ 14. Why are curved pole pieces used in practical motors? Answer: They create a radial magnetic field, keeping the turning effect close to maximum during rotation. ________________________________________ 15. What is the advantage of using an electromagnet instead of a permanent magnet? Answer: It allows the motor to work with alternating current (a.c.), because the magnetic field reverses with the current, keeping the turning effect in the same direction. ________________________________________ 16. Why does an a.c. motor continue to rotate even though the current changes direction? Answer: Because the electromagnet’s field also reverses, so the turning effect stays the same way. ________________________________________ 17. What is the main advantage of brushless motors? Answer: They don’t use brushes or commutators, reducing friction and wear, and are more efficient (used in electric and hybrid cars).
      • 10-C
        ·
        Назначено домашнее задание
        Kyrgyz Language
        :
        «Эне образын сактоодо Умай энелик философиянын орду» кыскача эссе жазуу.
      • 11-A
        ·
        Назначено домашнее задание
        Geography
        :
        Характеристика стран Северной и Латинской Америки. По выбору.
      • 11-A RU
        ·
        Назначено домашнее задание
        ОРТ РУССКИЙ ЯЗЫК
        :
        Орфография
      • 11-B
        ·
        Назначено домашнее задание
        Geography
        :
        Характеристика стран Северной и Латинской Америки. По выбору.
      • 11-B
        ·
        домашнее задание
        Physics
        :
        Diodes Q: How does a silicon diode behave in forward bias? A: It conducts current once the p.d. reaches about 0.6 V. Q: How does a silicon diode behave in reverse bias? A: It allows almost no current to flow. Q: Why is a milliammeter needed when measuring reverse current? A: The current is extremely small. ________________________________________ Practice-Style Concepts Q: Why wouldn’t a torch bulb light if the diode polarity is reversed? A: The diode is reverse biased and blocks the current. Q: What happens to a filament bulb if current increases? A: • It gets hotter • Resistance increases • The bulb becomes brighter (up to a limit)
      • 11-B
        ·
        Назначено домашнее задание
        Physics
        :
        What is an electric field? An electric field is a region around a charged object where another charge experiences an electric force. ________________________________________ What is electric field strength? Electric field strength is the force per unit positive charge at a point in an electric field. ________________________________________ How is electric field strength defined mathematically? E=FQE = \frac{F}{Q}E=QF where: • EEE = electric field strength • FFF = force on the charge • QQQ = magnitude of the charge ________________________________________ What is the unit of electric field strength? • newton per coulomb (N C⁻¹), or • volt per metre (V m⁻¹) Both units are equivalent. ________________________________________ How is force related to electric field strength? F=QEF = QEF=QE ________________________________________ Is electric field strength a scalar or a vector? It is a vector quantity. ________________________________________ What is the direction of the electric field? • The direction of the electric field is the same as the direction of the force on a positive test charge. • For a negative charge, the force is in the opposite direction to the field. ________________________________________ What is a test charge? A test charge is a very small positive charge used to measure the electric field without disturbing it. ________________________________________ What do electric field lines represent? • The direction of the electric field • They start from positive charges and end on negative charges ________________________________________ What happens to a charge placed in an electric field? The charge experiences an electric force due to the field. ________________________________________ How does a lightning conductor work? • A charged cloud creates a very strong electric field near the tip of the conductor. • The strong field ionises the air. • Charge leaks safely to the ground. • This reduces the chance of a lightning strike. ________________________________________ What is the electric field like between two parallel charged plates? • The field lines are straight, parallel, and perpendicular to the plates. • The field is uniform. ________________________________________ What does a uniform electric field mean? A uniform electric field has the same magnitude and direction at every point. ________________________________________ How do you calculate the electric field strength between two parallel plates? E=VdE = \frac{V}{d}E=dV where: • VVV = potential difference between the plates • ddd = distance between the plates ________________________________________ How is the equation E=VdE = \frac{V}{d}E=dV derived? 1. Force on a charge: F=QEF = QEF=QE 2. Work done moving the charge a distance ddd: W=Fd=QEdW = Fd = QEdW=Fd=QEd 3. Potential difference definition: V=WQ=EdV = \frac{W}{Q} = EdV=QW=Ed 4. Therefore: E=VdE = \frac{V}{d}E=dV ________________________________________ What kind of motion does a charged particle have in a uniform electric field? • It experiences a constant force. • It moves with constant acceleration. ________________________________________ What is the acceleration of a charged particle in an electric field? a=QEma = \frac{QE}{m}a=mQE where: • mmm = mass of the particle ________________________________________ How is motion in an electric field similar to motion in a gravitational field? • Electric field ↔ gravitational field • EEE replaces ggg • Projectile motion equations can be used with a=QEma = \frac{QE}{m}a=mQE ________________________________________ Quick summary (for exams): • E=F/QE = F/QE=F/Q • F=QEF = QEF=QE • E=V/dE = V/dE=V/d • Direction of EEE = force on a positive charge • Field between parallel plates is uniform
      • 11-B
        ·
        Назначено домашнее задание
        ОРТ РУССКИЙ ЯЗЫК
        :
        Повторение
      • 11-C
        ·
        домашнее задание
        Kyrgyz Language
        :
        Фразеологиялык талдоо
      • 11-C
        ·
        домашнее задание
        Physics
        :
        What is resistance? Answer: Resistance is a measure of how difficult it is for electric current to flow through a component. It is caused by collisions between charge carriers and the atoms (positive ions) in the material. ________________________________________ 2. What is the unit of resistance? Answer: The unit of resistance is the ohm (Ω). 1 ohm = 1 volt per ampere (1 Ω = 1 V/A). ________________________________________ 3. How is resistance calculated? Answer: Resistance is calculated using the formula: R=VIR = \frac{V}{I}R=IV where: • RRR = resistance (Ω) • VVV = potential difference (V) • III = current (A) ________________________________________ 4. What is Ohm’s Law? Answer: Ohm’s Law states that the current through a conductor is directly proportional to the potential difference across it, provided the temperature is constant. ________________________________________ 5. What equations come from Ohm’s Law? Answer: V=IRandI=VRV = IR \quad \text{and} \quad I = \frac{V}{R}V=IRandI=RV ________________________________________ 6. What are I–V characteristics? Answer: I–V characteristics show how current changes with voltage for a component. • Metallic conductor (constant temperature): Straight line through the origin • Filament lamp: Curved line (resistance increases as temperature rises) • Semiconductor diode: Current flows easily in one direction only ________________________________________ 7. What is the formula for resistivity? Answer: R=ρLAR = \rho \frac{L}{A}R=ρAL where: • ρ\rhoρ = resistivity of the material • LLL = length • AAA = cross-sectional area ________________________________________ 8. Worked Example – Part (a) Question: The current through a component is 2.0 mA when the p.d. is 12 V. What is its resistance? Answer: R=VI=122.0×10−3=6000 ΩR = \frac{V}{I} = \frac{12}{2.0 \times 10^{-3}} = 6000 \, \OmegaR=IV=2.0×10−312=6000Ω ________________________________________ 9. Worked Example – Part (b) Question: What is the p.d. when the current is 50 μA, assuming resistance is unchanged? Answer: V=IR=(50×10−6)×6000=0.3 VV = IR = (50 \times 10^{-6}) \times 6000 = 0.3 \, VV=IR=(50×10−6)×6000=0.3V What is a resistor? Answer: A resistor is a component designed to have a fixed resistance that remains the same regardless of the current flowing through it. ________________________________________ 2. How can the resistance of a resistor be measured? Answer: The resistance can be measured using a circuit that includes a resistor, an ammeter in series, and a voltmeter in parallel. ________________________________________ 3. What is the purpose of the ammeter in the circuit? Answer: The ammeter measures the current flowing through the resistor. ________________________________________ 4. Why must the ammeter be connected in series with the resistor? Answer: It must be in series so that the same current flows through both the ammeter and the resistor. ________________________________________ 5. What is the purpose of the voltmeter in the circuit? Answer: The voltmeter measures the potential difference (p.d.) across the resistor. ________________________________________ 6. Why must the voltmeter be connected in parallel with the resistor? Answer: It must be in parallel so that the voltmeter and the resistor have the same potential difference across them. ________________________________________ 7. Why should no current pass through the voltmeter? Answer: If current flows through the voltmeter, the ammeter will not measure the exact current in the resistor. ________________________________________ 8. What resistance should a voltmeter ideally have? Answer: In theory, a voltmeter should have infinite resistance. In practice, a very high resistance is sufficient. ________________________________________ 9. What is the purpose of the variable resistor? Answer: The variable resistor is used to adjust the current and potential difference in the circuit. ________________________________________ 10. How is the relationship between current and p.d. investigated? Answer: The variable resistor is adjusted in steps. At each step, the current and potential difference are recorded. ________________________________________ 11. How are the results displayed? Answer: The measurements are plotted on a graph of potential difference (p.d.) against current. ________________________________________ 12. What does a straight-line p.d.–current graph show? Answer: A straight-line graph shows that the resistor obeys Ohm’s Law and has constant resistance. Ohm’s Law 1. What does the I–V graph for a resistor look like? Answer: It is a straight line through the origin. ________________________________________ 2. What does a straight-line I–V graph show about resistance? Answer: It shows that the resistance is constant and does not change with current. ________________________________________ 3. Why is the resistance equal to the gradient of the V–I graph? Answer: Because the gradient is equal to potential difference divided by current (V/IV/IV/I), which is the definition of resistance. ________________________________________ 4. Who discovered Ohm’s Law and when? Answer: Ohm’s Law was discovered by Georg Ohm in 1826. ________________________________________ 5. State Ohm’s Law. Answer: Ohm’s Law states that the potential difference across a metallic conductor is proportional to the current through it, provided the physical conditions (such as temperature) remain constant. ________________________________________ 6. What does Ohm’s Law say about resistance? Answer: It states that the resistance of a metallic conductor is constant when physical conditions are unchanged. ________________________________________ 7. What equation applies to an ohmic conductor? Answer: V=IR where RRR is constant. ________________________________________ Resistivity 8. What is resistivity? Answer: Resistivity is a property of a material that indicates how strongly it resists the flow of electric current. ________________________________________ 9. How does resistance depend on the length of a conductor? Answer: Resistance is directly proportional to the length LLL of the conductor. ________________________________________ 10. How does resistance depend on cross-sectional area? Answer: Resistance is inversely proportional to the cross-sectional area AAA. ________________________________________ 11. What is the formula relating resistance, length, area, and resistivity? Answer: R=ρL/A ________________________________________ 12. What does the symbol ρ\rhoρ represent? Answer: ρ\rhoρ represents the resistivity of the material. ________________________________________ 13. How can resistivity be calculated from resistance? Answer: By rearranging the formula: ρ=RA/L
      • 11-D, 11-A RU
        ·
        домашнее задание
        Russian Literature
        :
        опереж. зад. подготовить презентацию по теме :М. Булгаков. Роман «Мастер и Маргарита»,
      • 11-D, 11-B, 11-A KG
        ·
        домашнее задание
        History
        :
        Параграф 6. Кыргызстандын 19 к. ортосунан 1917-ж. чейинки маданияты.
      • 11-D, 11-B, 11-A KG
        ·
        домашнее задание
        Kyrgyz Literature
        :
        Токтоболот Абдумомунов " Абийир кечирбейт" драмасын ,ролдорду бөлүштүрүп, сахналаштырып келгиле.
      • 11-D, 11-B, 11-A KG
        ·
        Назначено домашнее задание
        Russian Literature
        :
        Конспект , персонажи произведения , краткий пересказ
      • 11-D, 11-B, 11-A KG
        ·
        домашнее задание
        Russian Literature
        :
        Эссе " Судьба России и судьба женщины"
      • 7-A
        ·
        Назначено домашнее задание
        Russian Literature
        :
        Характеристика Толстого и Тонкого ,индивидуальные задания,сценка
      • 7-B
        ·
        домашнее задание
        Kyrgyz Language
        :
        5-көнүгүү
      • 7-B
        ·
        домашнее задание
        Russian Literature
        :
        Написать мини-сочинение: «Почему рассказ “Репетитор” остаётся актуальным?»
      • 8-B
        ·
        домашнее задание
        Geography
        :
        п.27
      • 8-B
        ·
        Назначено домашнее задание
        Geography
        :
        п.28
      • 8-C
        ·
        домашнее задание
        Geography
        :
        п.27
      • 8-C
        ·
        Назначено домашнее задание
        Geography
        :
        п.28
      • 8-C
        ·
        домашнее задание
        History
        :
        Глава 2. Освободительная борьба народов Восточного Тенир-Тоо против маньчжурского цинского господства. Параграф 4. Усиление гнета местного населения цинскими правителями.
      • 8-D
        ·
        домашнее задание
        English
        :
        2-көнүгүү
      • 8-D
        ·
        Назначено домашнее задание
        Human and Society
        :
        Домашнего задания нет.
      • 8-D
        ·
        домашнее задание
        Kyrgyz Language
        :
        Кайталоо
      • 8-D
        ·
        домашнее задание
        Mathematics
        :
        CB Ex 8.5
      • 9-A
        ·
        домашнее задание
        Physics
        :
        3.8 Gas Pressure and Volume – Key Points as Questions & Answers ________________________________________ Q1. What three factors describe the state of a gas? A. Pressure, volume, and temperature. ________________________________________ Q2. What happens if one of these factors changes? A. A change in one factor always causes a change in at least one of the others. ________________________________________ Q3. What does this topic focus on? A. How the pressure of a gas depends on its volume when the temperature is kept constant. ________________________________________ Q4. What type of gas is used in the experiment described? A. A fixed mass of dry air. ________________________________________ Q5. Why must the temperature be kept constant during the experiment? A. Squashing the gas warms it slightly, and Boyle’s law only applies when temperature is constant. ________________________________________ Q6. How are pressure changes transmitted to the trapped gas in the experiment? A. Through oil, which transmits the pressure from the reservoir to the gas. ________________________________________ Q7. What relationship is found between pressure and volume at constant temperature? A. Pressure is inversely proportional to volume. ________________________________________ Q8. What happens to the pressure if the volume of a gas is halved? A. The pressure doubles. ________________________________________ Q9. What mathematical relationship links pressure and volume? A. Pressure × volume = constant (PV = constant). ________________________________________ Q10. What law describes this relationship? A. Boyle’s law. ________________________________________ Q11. State Boyle’s law in words. A. For a fixed mass of gas at constant temperature, the pressure is inversely proportional to the volume. ________________________________________ Q12. How can Boyle’s law be written as an equation? A. ( p_1 V_1 = p_2 V_2 ) (when temperature is constant). ________________________________________ Q13. What type of graph is obtained when pressure is plotted against volume? A. A curve showing an inverse relationship. ________________________________________ Q14. What type of graph is obtained when pressure is plotted against 1/volume? A. A straight line through the origin. ________________________________________ Q15. How does kinetic theory explain Boyle’s law? A. When volume decreases, gas molecules are closer together, so they hit the container walls more often, increasing pressure. ________________________________________ Q16. Why does pressure increase when a balloon is squashed? A. The molecules collide with the walls more frequently due to reduced volume. ________________________________________ Q17. What is an ideal gas? A. A gas that exactly obeys Boyle’s law and has no attractive forces between its molecules. ________________________________________ Q18. Under what conditions do real gases behave like ideal gases? A. At low density, high temperature (well above liquefaction point), and low water vapour content. ________________________________________ Q19. What is the formula for pressure? A. Pressure = force ÷ area. ________________________________________ Q20. What are the units of pressure? A. Pascals (Pa), where 1 Pa = 1 N/m². ________________________________________ Q21. What is standard atmospheric pressure? A. About 100 000 Pa, also called 1 atmosphere (1 atm). ________________________________________ Q22. What happens to the volume of a gas when pressure decreases at constant temperature? A. The volume increases. ________________________________________ Q23. How can you tell from data that a gas obeys Boyle’s law? A. The product of pressure and volume is constant, or pressure is proportional to 1/volume. ________________________________________ Q24. What does kinetic theory say about gas particles? A. They are tiny, far apart, move freely at high speed, and collide with container walls to produce pressure. ________________________________________ Q25. How does temperature affect gas particles? A. Higher temperature means higher average particle speed.
      • 9-A
        ·
        Назначено домашнее задание
        Physics
        :
        Work and Energy – Questions & Answers 1. What does “work” mean in science? Answer: Work is done whenever a force causes an object to move. ________________________________________ 2. What two factors affect how much work is done? Answer: • The size of the force • The distance moved in the direction of the force ________________________________________ 3. What is the SI unit of work? Answer: The joule (J). ________________________________________ 4. What is 1 joule of work? Answer: 1 joule of work is done when a force of 1 newton moves an object 1 metre in the direction of the force. ________________________________________ 5. What equation is used to calculate work done? Answer: Work done=force×distance moved\text{Work done} = \text{force} \times \text{distance moved}Work done=force×distance moved or W=F×dW = F \times dW=F×d ________________________________________ 6. How much work is done if a 4 N force moves an object 3 m? Answer: 12 J. ________________________________________ 7. What is a kilojoule (kJ)? Answer: 1 kilojoule = 1000 joules (10³ J). ________________________________________ 8. What is a megajoule (MJ)? Answer: 1 megajoule = 1,000,000 joules (10⁶ J). ________________________________________ Energy 9. What is energy? Answer: Energy is a measurement of how much work can be done. ________________________________________ 10. What is the unit of energy? Answer: The joule (J), the same unit as work. ________________________________________ 11. Is energy a physical “thing”? Answer: No. Energy is not a thing, but a way of measuring the ability to do work. ________________________________________ 12. Why does a compressed spring store energy? Answer: Because it can do work when released. ________________________________________ 13. Why do moving objects store energy? Answer: Because their motion allows them to do work, such as knocking something over. ________________________________________ 14. Why do all materials store thermal energy? Answer: Because their particles are always moving. ________________________________________ 15. What happens to particle motion when a material is heated? Answer: The particles move faster. ________________________________________ Energy Stores 16. What is kinetic energy? Answer: Energy stored by an object because it is moving. ________________________________________ 17. What is gravitational potential energy? Answer: Energy stored by an object because it has been lifted against gravity. ________________________________________ 18. What is elastic (strain) energy? Answer: Energy stored when an object is stretched or compressed, such as a spring or rubber band. ________________________________________ 19. What is chemical energy? Answer: Energy stored in chemical bonds, such as in fuels, food, and batteries. ________________________________________ 20. What is electrostatic energy? Answer: Energy stored when electric charges attract each other but are held apart. ________________________________________ 21. What is nuclear energy? Answer: Energy stored in the nucleus of an atom, released during nuclear reactions. ________________________________________ 22. What is thermal energy? Answer: Energy stored due to the motion of particles inside a material, often called heat. ________________________________________ 23. What is magnetic energy? Answer: Energy stored when magnets attract or repel but are held apart. ________________________________________ 24. What is the general name for energy stored due to position? Answer: Potential energy. ________________________________________ Energy Pathways 25. What is meant by energy transfer? Answer: Energy moving from one store to another. ________________________________________ 26. What are the four main energy pathways? Answer: • Mechanically (by forces) • Electrically (by currents) • By heating (due to temperature difference) • By radiation (light or sound waves) ________________________________________ 27. Why is electrical energy not an energy store? Answer: Because electric current transfers energy but does not store it.
      • 9-B
        ·
        домашнее задание
        History
        :
        ТЕСТ. Параграф 4-5. Кыргызстан в годы гражданской войны и интервенции (1918 - 1920 гг.).
      • 9-D
        ·
        Назначено домашнее задание
        History of Religions
        :
        Жизь и биография Имам Аазам Ханафийский масхаб-презентация
      • Чт29. 01.
      • 10-A
        ·
        Назначено домашнее задание
        Russian Language
        :
        Повторение
      • 10-A
        ·
        домашнее задание
        Russian Language
        :
        Тренир.упр
      • 10-A, 10-C FIZ-MAT
        ·
        домашнее задание
        Physics
        :
      • 10-B
        ·
        Назначено домашнее задание
        Geography
        :
        т.1
      • 10-B
        ·
        домашнее задание
        Geography
        :
        тема1 п.1
      • 10-B
        ·
        Назначено домашнее задание
        Kyrgyz Literature
        :
        "Курманбек " ырын жаттоо, К.Жантөшевдин өмүрү- чыгармачылыгы боюнча презентация жасоо. РАФТ жазуу,
      • 10-B
        ·
        Назначено домашнее задание
        Kyrgyz Literature
        :
        "Курманбек " ырын жаттоо, К.Жантөшевдин өмүрү- чыгармачылыгы боюнча презентация жасоо. РАФТ жазуу,
      • 10-B
        ·
        домашнее задание
        Kyrgyz Literature
        :
        "Курманбек " ырын жаттоо, К.Жантөшевдин өмүрү- чыгармачылыгы боюнча презентация жасоо. РАФТ жазуу,
      • 11-B RU
        ·
        Назначено домашнее задание
        Russian Language
        :
        Базовый уровень: Выписать из художественного текста 5 предложений с обобщающим словом. Повышенный уровень: Написать мини-текст (5–6 предложений), используя разные позиции обобщающего слова
      • 11-B RU
        ·
        домашнее задание
        Russian Language
        :
        творческая часть (на выбор) Вариант А. Стилистика Составьте мини-текст (4–5 предложений) на тему «Школьные годы», используя: минимум два обобщающих слова; • разные позиции обобщающего слова (до и после однородных членов Вариант Б. Анализ Найдите в художественном произведении или публицистическом тексте 2 предложения с обобщающим словом. Выпишите их и: 1.подчеркните обобщающее слово; 2.объясните постановку знаков препинания; 3.укажите стилистическую роль.
      • 11-C
        ·
        домашнее задание
        Physics
        :
        What is an electric field? An electric field is a region around a charged object where another charge experiences an electric force. ________________________________________ What is electric field strength? Electric field strength is the force per unit positive charge at a point in an electric field. ________________________________________ How is electric field strength defined mathematically? E=F/Q where: • E = electric field strength • F = force on the charge • Q = magnitude of the charge ________________________________________ What is the unit of electric field strength? • newton per coulomb (N C⁻¹), or • volt per metre (V m⁻¹) Both units are equivalent. ________________________________________ How is force related to electric field strength? F=QE ________________________________________ Is electric field strength a scalar or a vector? It is a vector quantity. ________________________________________ What is the direction of the electric field? • The direction of the electric field is the same as the direction of the force on a positive test charge. • For a negative charge, the force is in the opposite direction to the field. ________________________________________ What is a test charge? A test charge is a very small positive charge used to measure the electric field without disturbing it. ________________________________________ What do electric field lines represent? • The direction of the electric field • They start from positive charges and end on negative charges ________________________________________ What happens to a charge placed in an electric field? The charge experiences an electric force due to the field. ________________________________________ How does a lightning conductor work? • A charged cloud creates a very strong electric field near the tip of the conductor. • The strong field ionises the air. • Charge leaks safely to the ground. • This reduces the chance of a lightning strike. ________________________________________ What is the electric field like between two parallel charged plates? • The field lines are straight, parallel, and perpendicular to the plates. • The field is uniform. ________________________________________ What does a uniform electric field mean? A uniform electric field has the same magnitude and direction at every point. ________________________________________ How do you calculate the electric field strength between two parallel plates? E=V/d where: • V = potential difference between the plates • d = distance between the plates ________________________________________ How is the equation E=V/d derived? 1. Force on a charge: F=QE 2. Work done moving the charge a distance ddd: W=Fd 3. Potential difference definition: V=WQ=Ed 4. Therefore: E=Vd ________________________________________ What kind of motion does a charged particle have in a uniform electric field? • It experiences a constant force. • It moves with constant acceleration. ________________________________________ What is the acceleration of a charged particle in an electric field? a=QEm where: • m = mass of the particle ________________________________________ How is motion in an electric field similar to motion in a gravitational field? • Electric field ↔ gravitational field • E replaces ggg • Projectile motion equations can be used with a=QEm ________________________________________ Quick summary (for exams): • E=F/QE = F/QE=F/Q • F=QEF = QEF=QE • E=V/dE = V/dE=V/d • Direction of EEE = force on a positive charge • Field between parallel plates is uniform
      • 11-C
        ·
        домашнее задание
        Russian Literature
        :
        1.Эссе: «Сила слабого человека: Иешуа га-Ноцри» 2. Сравнительный анализ: Иешуа и Мастер 3. Творческая работа: коллаж / визуальный образ Иешуа с пояснение
      • 11-C
        ·
        домашнее задание
        Russian Literature
        :
        знать сюжет, тему и героев поэмы; опереж. зад. подготовить презентацию по теме :М. Булгаков. Роман «Мастер и Маргарита»,
      • 11-C
        ·
        Назначено домашнее задание
        Russian Literature
        :
        мини-эссе «Любовь как спасение в романе “Мастер и Маргарита”» письмо Маргариты Мастеру (или наоборот) внутренний монолог Мастера в психиатрической клинике иллюстрация к образу Маргариты + письменный комментарий
      • 11-D, 11-A RU
        ·
        домашнее задание
        Russian Literature
        :
        знать историю создания сюжет романа, тему и героев ; опереж. зад. подготовить презентацию по теме :М. Булгаков. Роман «Мастер и Маргарита"
      • 7-A
        ·
        домашнее задание
        History of Religions
        :
        выучить
      • 7-A
        ·
        Назначено домашнее задание
        Russian Language
        :
        3 лич.гл,безлич.гл
      • 7-A
        ·
        домашнее задание
        Russian Language
        :
        упр 278
      • 7-B
        ·
        домашнее задание
        History
        :
        Параграф 31. ЗОЛОТАЯ ОРДА И ГОСУДАРСТВО ХУЛАГУИДОВ.
      • 7-B
        ·
        Назначено домашнее задание
        Mathematics
        :
        CB 7.4 and WB 7.2
      • 7-B
        ·
        домашнее задание
        Mathematics
        :
        WB Ex 7.3
      • 7-B
        ·
        домашнее задание
        Russian Language
        :
        Стр. 128 упр 215
      • 7-B
        ·
        домашнее задание
        Turkish Language
        :
        Hafta içi ve hafta sonu neler yaparsınız,. Neler yapmayı seversiniz ve neler yapmayı sevmezsiniz? Defterinize yazınız.
      • 7-С
        ·
        домашнее задание
        Russian Literature
        :
        Написать мини-ситуацию (5–6 предложений) с комическим эффектом
      • 8-A
        ·
        Назначено домашнее задание
        Russian Language
        :
        Прямое дополнение
      • 8-A
        ·
        домашнее задание
        Russian Language
        :
        упр 177,стр 95
      • 8-B
        ·
        домашнее задание
        Human and Society
        :
        Домашнего задания нет.
      • 8-C
        ·
        домашнее задание
        History
        :
        Тест. Параграф 5. Освободительное движение Джангира-ходжи.
      • 8-C
        ·
        домашнее задание
        Russian Language
        :
        Стр.115 упр244
      • 8-C
        ·
        Назначено домашнее задание
        Russian Language
        :
        Стр.125 упр 266
      • 8-C
        ·
        домашнее задание
        Russian Literature
        :
        А.Грин "Зеленая лампа"
      • 8-C
        ·
        Назначено домашнее задание
        Russian Literature
        :
        Мини-сочинение: «Что стало настоящим испытанием для Джона Ива?»
      • 8-D
        ·
        домашнее задание
        Geography
        :
        п.27
      • 8-D
        ·
        Назначено домашнее задание
        Geography
        :
        п.28
      • 8-D
        ·
        домашнее задание
        Mathematics
        :
        WB Ex 8.5
      • 9-A
        ·
        домашнее задание
        Kyrgyz Literature
        :
        ит жашоосу менен адам жашоосу
      • 9-B
        ·
        Назначено домашнее задание
        Geography
        :
        п.19
      • 9-B
        ·
        домашнее задание
        Geography
        :
        презентация
      • 9-B
        ·
        домашнее задание
        History
        :
        Глава 2. Кыргызстан в годы НЭП (1921 - 1928 гг.). Параграф 6. Социально-экономическое развитие Кыргызстана в годы НЭП.
      • 9-B
        ·
        домашнее задание
        Physics
        :
        3.8 Gas Pressure and Volume – Key Points as Questions & Answers ________________________________________ Q1. What three factors describe the state of a gas? A. Pressure, volume, and temperature.18 + ________________________________________ Q2. What happens if one of these factors changes? A. A change in one factor always causes a change in at least one of the others. ________________________________________ Q3. What does this topic focus on? A. How the pressure of a gas depends on its volume when the temperature is kept constant. ________________________________________ Q4. What type of gas is used in the experiment described? A. A fixed mass of dry air. ________________________________________ Q5. Why must the temperature be kept constant during the experiment? A. Squashing the gas warms it slightly, and Boyle’s law only applies when temperature is constant. ________________________________________ Q6. How are pressure changes transmitted to the trapped gas in the experiment? A. Through oil, which transmits the pressure from the reservoir to the gas. ________________________________________ Q7. What relationship is found between pressure and volume at constant temperature? A. Pressure is inversely proportional to volume. ________________________________________ Q8. What happens to the pressure if the volume of a gas is halved? A. The pressure doubles. ________________________________________ Q9. What mathematical relationship links pressure and volume? A. Pressure × volume = constant (PV = constant). ________________________________________ Q10. What law describes this relationship? A. Boyle’s law. ________________________________________ Q11. State Boyle’s law in words. A. For a fixed mass of gas at constant temperature, the pressure is inversely proportional to the volume. ________________________________________ Q12. How can Boyle’s law be written as an equation? A. ( p_1 V_1 = p_2 V_2 ) (when temperature is constant). ________________________________________ Q13. What type of graph is obtained when pressure is plotted against volume? A. A curve showing an inverse relationship. ________________________________________ Q14. What type of graph is obtained when pressure is plotted against 1/volume? A. A straight line through the origin. ________________________________________ Q15. How does kinetic theory explain Boyle’s law? A. When volume decreases, gas molecules are closer together, so they hit the container walls more often, increasing pressure. ________________________________________ Q16. Why does pressure increase when a balloon is squashed? A. The molecules collide with the walls more frequently due to reduced volume. ________________________________________ Q17. What is an ideal gas? A. A gas that exactly obeys Boyle’s law and has no attractive forces between its molecules. ________________________________________ Q18. Under what conditions do real gases behave like ideal gases? A. At low density, high temperature (well above liquefaction point), and low water vapour content. ________________________________________ Q19. What is the formula for pressure? A. Pressure = force ÷ area. ________________________________________ Q20. What are the units of pressure? A. Pascals (Pa), where 1 Pa = 1 N/m². ________________________________________ Q21. What is standard atmospheric pressure? A. About 100 000 Pa, also called 1 atmosphere (1 atm). ________________________________________ Q22. What happens to the volume of a gas when pressure decreases at constant temperature? A. The volume increases. ________________________________________ Q23. How can you tell from data that a gas obeys Boyle’s law? A. The product of pressure and volume is constant, or pressure is proportional to 1/volume. ________________________________________ Q24. What does kinetic theory say about gas particles? A. They are tiny, far apart, move freely at high speed, and collide with container walls to produce pressure. ________________________________________ Q25. How does temperature affect gas particles? A. Higher temperature means higher average particle speed.
      • 9-C
        ·
        Назначено домашнее задание
        Geography
        :
        п.19
      • 9-C
        ·
        домашнее задание
        Geography
        :
        презентация
      • 9-D
        ·
        домашнее задание
        Physics
        :
        Work and Energy – Questions & Answers 1. What does “work” mean in science? Answer: Work is done whenever a force causes an object to move. ________________________________________ 2. What two factors affect how much work is done? Answer: • The size of the force • The distance moved in the direction of the force ________________________________________ 3. What is the SI unit of work? Answer: The joule (J). ________________________________________ 4. What is 1 joule of work? Answer: 1 joule of work is done when a force of 1 newton moves an object 1 metre in the direction of the force. ________________________________________ 5. What equation is used to calculate work done? Answer: Work done=force×distance moved\text{Work done} = \text{force} \times \text{distance moved}Work done=force×distance moved or W=F×dW = F \times dW=F×d ________________________________________ 6. How much work is done if a 4 N force moves an object 3 m? Answer: 12 J. ________________________________________ 7. What is a kilojoule (kJ)? Answer: 1 kilojoule = 1000 joules (10³ J). ________________________________________ 8. What is a megajoule (MJ)? Answer: 1 megajoule = 1,000,000 joules (10⁶ J). ________________________________________ Energy 9. What is energy? Answer: Energy is a measurement of how much work can be done. ________________________________________ 10. What is the unit of energy? Answer: The joule (J), the same unit as work. ________________________________________ 11. Is energy a physical “thing”? Answer: No. Energy is not a thing, but a way of measuring the ability to do work. ________________________________________ 12. Why does a compressed spring store energy? Answer: Because it can do work when released. ________________________________________ 13. Why do moving objects store energy? Answer: Because their motion allows them to do work, such as knocking something over. ________________________________________ 14. Why do all materials store thermal energy? Answer: Because their particles are always moving. ________________________________________ 15. What happens to particle motion when a material is heated? Answer: The particles move faster. ________________________________________ Energy Stores 16. What is kinetic energy? Answer: Energy stored by an object because it is moving. ________________________________________ 17. What is gravitational potential energy? Answer: Energy stored by an object because it has been lifted against gravity. ________________________________________ 18. What is elastic (strain) energy? Answer: Energy stored when an object is stretched or compressed, such as a spring or rubber band. ________________________________________ 19. What is chemical energy? Answer: Energy stored in chemical bonds, such as in fuels, food, and batteries. ________________________________________ 20. What is electrostatic energy? Answer: Energy stored when electric charges attract each other but are held apart. ________________________________________ 21. What is nuclear energy? Answer: Energy stored in the nucleus of an atom, released during nuclear reactions. ________________________________________ 22. What is thermal energy? Answer: Energy stored due to the motion of particles inside a material, often called heat. ________________________________________ 23. What is magnetic energy? Answer: Energy stored when magnets attract or repel but are held apart. ________________________________________ 24. What is the general name for energy stored due to position? Answer: Potential energy. ________________________________________ Energy Pathways 25. What is meant by energy transfer? Answer: Energy moving from one store to another. ________________________________________ 26. What are the four main energy pathways? Answer: • Mechanically (by forces) • Electrically (by currents) • By heating (due to temperature difference) • By radiation (light or sound waves) ________________________________________ 27. Why is electrical energy not an energy store? Answer: Because electric current transfers energy but does not store it.
      • 9-D
        ·
        домашнее задание
        Russian Literature
        :
        Анализ стих-я " Если жизнь тебя обманет..."
      • 9-D
        ·
        Назначено домашнее задание
        Russian Literature
        :
        Сценка из поэмы,конспект
      • Пт30. 01.
      • 10-A, 10-C FIZ-MAT
        ·
        домашнее задание
        Physics
        :
        Electromagnetic Induction – Questions & Answers Q1. What is electromagnetic induction? Electromagnetic induction is the process of generating an e.m.f. (voltage) in a wire when it moves through a magnetic field or when a magnetic field changes around it. ________________________________________ Q2. What happens when a wire moves across a magnetic field? A small e.m.f. (voltage) is induced in the wire. If the wire is part of a complete circuit, an electric current flows. ________________________________________ Q3. What is induced e.m.f.? Induced e.m.f. is the voltage produced in a conductor when it cuts magnetic field lines. ________________________________________ Q4. What is needed for a current to flow in a circuit? • A complete circuit (no breaks) • A source of e.m.f. (such as a battery or induced e.m.f.) ________________________________________ Q5. What instrument is used to detect very small currents? A galvanometer. A centre-zero galvanometer shows current direction by deflecting left or right from zero. ________________________________________ Q6. What does e.m.f. stand for and what is it measured in? E.m.f. stands for electromotive force and is measured in volts (V). ________________________________________ Q7. How can the induced e.m.f. (or current) in a moving wire be increased? By: • Moving the wire faster • Using a stronger magnet • Increasing the length of wire in the magnetic field (e.g. looping the wire) ________________________________________ Q8. State Faraday’s law of electromagnetic induction (simplified). The induced e.m.f. in a conductor is proportional to the rate at which magnetic field lines are cut. ________________________________________ Q9. What do magnetic field lines represent? They show: • The direction of the magnetic field • The strength of the field (closer lines = stronger field) ________________________________________ Q10. How can the direction of the induced current be reversed in a wire? By: • Moving the wire in the opposite direction • Reversing the direction of the magnetic field (turning the magnet around) ________________________________________ Q11. When is no e.m.f. induced in a wire? • When the wire is not moving • When the wire moves parallel to the magnetic field lines ________________________________________ Q12. What happens when a magnet is pushed into a coil? An e.m.f. is induced in the coil because the magnetic field is changing and field lines are being cut. ________________________________________ Q13. How can the induced e.m.f. in a coil be increased? By: • Moving the magnet faster • Using a stronger magnet • Increasing the number of turns in the coil ________________________________________ Q14. What happens to the current when the magnet is pulled out of the coil? The direction of the induced current is reversed. ________________________________________ Q15. What happens if the south pole of a magnet is pushed into the coil instead of the north pole? The direction of the induced current is reversed. ________________________________________ Q16. What happens if the magnet is held still inside the coil? No e.m.f. or current is induced because no field lines are being cut. ________________________________________ Q17. Give two everyday applications of electromagnetic induction. • Playback heads in video recorders and hard drives • Electric guitar pickups, where vibrating strings induce current in coils Topic: Electromagnetic Induction Q1: What is electromagnetic induction? A1: It is the process of generating an electromotive force (e.m.f., or voltage) in a wire or coil when it moves through a magnetic field, or when the magnetic field around it changes. Q2: What three conditions are necessary to induce an e.m.f. and current? A2: 1) A magnetic field must be present. 2) There must be relative motion between the conductor (wire/coil) and the magnetic field (so that field lines are being "cut"). 3) The conductor must be part of a complete circuit for a current to flow. Q3: How can you detect an induced current? A3: Using a sensitive centre-zero galvanometer. The pointer deflects left or right depending on the direction of the current. Q4: What are the four factors that increase the size of an induced e.m.f. (and current)? A4: 1. Moving the wire/magnet faster (increasing the rate). 2. Using a stronger magnet (increasing the magnetic field strength). 3. Increasing the length of the wire in the field. 4. Increasing the number of turns on a coil (this effectively increases the length of wire cutting the field). Q5: What does Faraday's law (in simplified form) state? A5: The induced e.m.f. in a conductor is proportional to the rate at which magnetic field lines are cut by the conductor. Q6: What two things will reverse the direction of the induced e.m.f. and current? A6: 1. Reversing the direction of motion (e.g., pushing a magnet into vs. pulling it out of a coil). 2. Reversing the direction of the magnetic field (e.g., using the opposite pole of the magnet). Q7: When is no e.m.f. induced? A7: When there is no relative motion, or when the conductor is moving parallel to the magnetic field lines (so no field lines are being cut). Q8: How does electromagnetic induction apply to a magnet and a coil? A8: Pushing a magnet into a coil induces an e.m.f. because the moving magnetic field cuts the wire loops of the coil. The same factors that affect a moving wire (speed, magnet strength, coil turns) affect the induced e.m.f. here. Q9: Give two practical applications of electromagnetic induction. A9: 1. Playback heads in hard drives or tape recorders: a varying e.m.f. is induced in a coil as a magnetized disc/tape moves past it, converting stored magnetic patterns into electrical signals. 2. Electric guitar pickups: The magnetized steel strings vibrate above a coil, inducing a varying current that is amplified to produce sound.
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        Назначено домашнее задание
        Russian Literature
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        дописать эссе ; опереж.зад.
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        Russian Literature
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        знать сюжет, тему,идею и героев романа Идиот
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        Назначено домашнее задание
        Kyrgyz Literature
        :
        Алыкул Осмонов боюнча чыгармачылык иш жасоо.Мен кыргыздын акыны","Пушкинге" ырларынын бирөөсүн жаттап көркөм айтып берүү.
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        ·
        домашнее задание
        ОРТ КЫРГЫЗ ТИЛИ
        :
        Практикалык грамматикадан тест менен иштөө
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        домашнее задание
        Russian Literature
        :
        знать сюжет, тему и героев поэмы; опереж. зад. подготовить презентацию по теме :М. Булгаков. Роман «Мастер и Маргарита» .Иеуша Га Ноцри ,написать рафт от Мастера, Ивана Бездомного и Маргариты о Мастера
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        Russian Literature
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        мини-эссе «Любовь как спасение в романе “Мастер и Маргарита”» письмо Маргариты Мастеру (или наоборот) внутренний монолог Мастера в психиатрической клинике иллюстрация к образу Маргариты + письменный комментарий
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        домашнее задание
        Kyrgyz Literature
        :
        Ырды жаттап, көркөм окуу (айтуу)
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        домашнее задание
        Physics
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        Fleming’s Left-Hand Rule
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        Назначено домашнее задание
        ОРТ РУССКИЙ ЯЗЫК
        :
        Подготовка к тесту
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        Назначено домашнее задание
        Russian Literature
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        мини-эссе «Любовь как спасение в романе “Мастер и Маргарита”» письмо Маргариты Мастеру (или наоборот) внутренний монолог Мастера в психиатрической клинике иллюстрация к образу Маргариты + письменный комментарий
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        Kyrgyz Language
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        Араб тилинен кирген 20 сөз жазып,жаттап келүү
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        домашнее задание
        Russian Language
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        Повторение
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        Mathematics
        :
        CB Ex 7.3
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        домашнее задание
        Russian Literature
        :
        Написать мини-ситуацию (5–6 предложений) с комическим эффектом
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        Russian Literature
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        домашнее задание
        History
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        Тест. Параграф 31. ЗОЛОТАЯ ОРДА И ГОСУДАРСТВО ХУЛАГУИДОВ.
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        домашнее задание
        Russian Language
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        Стр. 128 упр 215
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        History
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        Тест. Параграф 5. Освободительное движение Джангира-ходжи.
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        домашнее задание
        Human and Society
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        Домашнего задания нет.
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        домашнее задание
        Kyrgyz Language
        :
        3-көнүгүү Бал аарысын изилдөө 117-118-бет
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        домашнее задание
        History
        :
        Тест. Тест. Параграф 5. Освободительное движение Джангира-ходжи.
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        домашнее задание
        Russian Literature
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        Выучить стих " Родина"
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        домашнее задание
        Russian Literature
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        Южные поэмы («Цыганы», «Бахчисарайский фонтан»).
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        домашнее задание
        Russian Language
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        Подготовка к тесту
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        Назначено домашнее задание
        Russian Language
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        Синтак.разбор