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Induced potential, transformers and the National Grid: AQA GCSE Physics questions

Every AQA GCSE Physics exam question on 4.7.3 Induced potential, transformers and the National Grid, 2018–2025, with its mark scheme and examiner’s report.

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1,653 questions

  1. Q09.1

    June 2025 · Paper 2 Higher

    1 mark4.7.3 Induced potential, transformers and the National Grid
    The whole paper ↗
    June 2025 Paper 2 Higher, question 09.1: Figure 11 shows a transformer. Figure 11 Why is the core of the transformer made from iron? [1 mark]

  2. Q09.2

    June 2025 · Paper 2 Higher

    4 marks4.7.3 Induced potential, transformers and the National Grid
    The whole paper ↗
    June 2025 Paper 2 Higher, question 09.2: A transformer has 345 turns on the primary coil and 6000 turns on the secondary coil. The potential difference across the secondary coil is 400 kV. Calculate th

  3. Q09.3

    June 2025 · Paper 2 Higher

    3 marks4.7.3 Induced potential, transformers and the National Grid
    The whole paper ↗
    June 2025 Paper 2 Higher, question 09.3: There is an alternating current in the primary coil of a transformer. Explain why there is an alternating potential difference across the ends of the secondary

  4. Q08.1

    June 2024 · Paper 2 Higher

    1 mark4.7.3 Induced potential, transformers and the National Grid
    The whole paper ↗
    June 2024 Paper 2 Higher, question 08.1: What effect did this demonstrate? [1 mark]

  5. Q08.2

    June 2024 · Paper 2 Higher

    3 marks4.7.3 Induced potential, transformers and the National Grid
    The whole paper ↗
    June 2024 Paper 2 Higher, question 08.2: Explain why a current was detected when the wire in Figure 13 was moved upwards. [3 marks]

  6. Q08.3

    June 2024 · Paper 2 Higher

    1 mark4.7.3 Induced potential, transformers and the National Grid
    The whole paper ↗
    June 2024 Paper 2 Higher, question 08.3: The teacher reversed the direction of the magnetic field. The teacher replaced the wire in its original position. The teacher moved the wire upwards in the same

  7. Q08.4

    June 2024 · Paper 2 Higher

    3 marks4.7.3 Induced potential, transformers and the National Grid
    The whole paper ↗
    June 2024 Paper 2 Higher, question 08.4: Figure 14 shows a sound wave incident on the diaphragm of a moving-coil microphone. The inside of the microphone includes a small coil of wire and a magnet. Fig

  8. Q04.1

    June 2023 · Paper 2 Higher

    1 mark4.7.3 Induced potential, transformers and the National Grid
    The whole paper ↗
    June 2023 Paper 2 Higher, question 04.1: Complete the sentence. [1 mark] The microphone is used to convert the pressure variations in sound waves into variations in .

  9. Q08.1

    June 2023 · Paper 2 Higher

    2 marks4.7.3 Induced potential, transformers and the National Grid
    The whole paper ↗
    June 2023 Paper 2 Higher, question 08.1: What material is used to make the core of the transformer? Give the reason for using this material. [2 marks] Material Reason

  10. Q08.2

    June 2023 · Paper 2 Higher

    5 marks4.7.3 Induced potential, transformers and the National Grid
    Mark scheme (PDF)
    The whole paper ↗
    June 2023 Paper 2 Higher, question 08.2: Determine the current in the secondary coil when the power output of the transformer is 6.9 W. The transformer is 100% efficient. Use the Physics Equations Shee

  11. Q09.1

    June 2023 · Paper 2 Higher

    5 marks4.7.1 Permanent and induced magnetism, magnetic forces and fields4.7.3 Induced potential, transformers and the National Grid
    The whole paper ↗
    June 2023 Paper 2 Higher, question 09.1: The coil is rotated. Explain why a direct current is induced in the coil. [5 marks]

  12. Q09.2

    June 2023 · Paper 2 Higher

    1 mark4.7.3 Induced potential, transformers and the National Grid
    The whole paper ↗
    June 2023 Paper 2 Higher, question 09.2: Sketch a graph on Figure 23 to show how the potential difference generated across the lamp varies for two complete revolutions of the dynamo coil. [1 mark] Figu

  13. Q09.3

    June 2023 · Paper 2 Higher

    3 marks4.7.3 Induced potential, transformers and the National Grid
    The whole paper ↗
    June 2023 Paper 2 Higher, question 09.3: The lamp is disconnected from the dynamo. Explain why the dynamo becomes much easier to turn. [3 marks]

  14. Q07.1

    June 2022 · Paper 2 Higher

    2 marks4.7.3 Induced potential, transformers and the National Grid
    The whole paper ↗
    June 2022 Paper 2 Higher, question 07.1: Identify the parts of the transformer labelled in Figure 12. [2 marks] A B C

  15. Q07.2

    June 2022 · Paper 2 Higher

    3 marks4.7.3 Induced potential, transformers and the National Grid
    Mark scheme (PDF)
    The whole paper ↗
    June 2022 Paper 2 Higher, question 07.2: There is an alternating input pd of 230 V. Determine the output pd. Use the Physics Equations Sheet. [3 marks] Output pd = V

  16. Q07.3

    June 2022 · Paper 2 Higher

    3 marks4.7.3 Induced potential, transformers and the National Grid
    The whole paper ↗
    June 2022 Paper 2 Higher, question 07.3: The input pd causes an alternating current. Explain why there is an alternating current in the output when the transformer is connected to a circuit. [3 marks]

  17. Q07.1

    November 2020 · Paper 2 Higher

    2 marks4.7.3 Induced potential, transformers and the National Grid
    The whole paper ↗
    November 2020 Paper 2 Higher, question 07.1: The portable power supply has an alternator connected to a transformer. The transformer can be adjusted to have different numbers of turns on the secondary coil

  18. Q07.2

    November 2020 · Paper 2 Higher

    3 marks4.7.3 Induced potential, transformers and the National Grid
    The whole paper ↗
    November 2020 Paper 2 Higher, question 07.2: A lamp is connected to the power supply. The lamp requires an input potential difference of 5.0 V. The alternator generates a potential difference of 1.5 V. The

  19. Q07.3

    November 2020 · Paper 2 Higher

    5 marks4.7.3 Induced potential, transformers and the National Grid
    The whole paper ↗
    November 2020 Paper 2 Higher, question 07.3: The handle of the alternator is turned, causing the coil to rotate. Explain why an alternating current is induced in the coil. [5 marks]

  20. Q07.4

    November 2020 · Paper 2 Higher

    1 mark4.7.3 Induced potential, transformers and the National Grid
    The whole paper ↗
    November 2020 Paper 2 Higher, question 07.4: Suggest the purpose of the slip rings. [1 mark]
All 33 questions on Induced potential, transformers and the National Grid, as a list
  1. June 2025, Paper 2 Higher, Q09.1 (1 mark): Figure 11 shows a transformer. Figure 11 Why is the core of the transformer made from iron? [1 mark]
  2. June 2025, Paper 2 Higher, Q09.2 (4 marks): A transformer has 345 turns on the primary coil and 6000 turns on the secondary coil. The potential difference across the secondary coil is 400 kV. Calculate th
  3. June 2025, Paper 2 Higher, Q09.3 (3 marks): There is an alternating current in the primary coil of a transformer. Explain why there is an alternating potential difference across the ends of the secondary
  4. June 2024, Paper 2 Higher, Q08.1 (1 mark): What effect did this demonstrate? [1 mark]
  5. June 2024, Paper 2 Higher, Q08.2 (3 marks): Explain why a current was detected when the wire in Figure 13 was moved upwards. [3 marks]
  6. June 2024, Paper 2 Higher, Q08.3 (1 mark): The teacher reversed the direction of the magnetic field. The teacher replaced the wire in its original position. The teacher moved the wire upwards in the same
  7. June 2024, Paper 2 Higher, Q08.4 (3 marks): Figure 14 shows a sound wave incident on the diaphragm of a moving-coil microphone. The inside of the microphone includes a small coil of wire and a magnet. Fig
  8. June 2023, Paper 2 Higher, Q04.1 (1 mark): Complete the sentence. [1 mark] The microphone is used to convert the pressure variations in sound waves into variations in .
  9. June 2023, Paper 2 Higher, Q08.1 (2 marks): What material is used to make the core of the transformer? Give the reason for using this material. [2 marks] Material Reason
  10. June 2023, Paper 2 Higher, Q08.2 (5 marks): Determine the current in the secondary coil when the power output of the transformer is 6.9 W. The transformer is 100% efficient. Use the Physics Equations Shee
  11. June 2023, Paper 2 Higher, Q09.1 (5 marks): The coil is rotated. Explain why a direct current is induced in the coil. [5 marks]
  12. June 2023, Paper 2 Higher, Q09.2 (1 mark): Sketch a graph on Figure 23 to show how the potential difference generated across the lamp varies for two complete revolutions of the dynamo coil. [1 mark] Figu
  13. June 2023, Paper 2 Higher, Q09.3 (3 marks): The lamp is disconnected from the dynamo. Explain why the dynamo becomes much easier to turn. [3 marks]
  14. June 2022, Paper 2 Higher, Q07.1 (2 marks): Identify the parts of the transformer labelled in Figure 12. [2 marks] A B C
  15. June 2022, Paper 2 Higher, Q07.2 (3 marks): There is an alternating input pd of 230 V. Determine the output pd. Use the Physics Equations Sheet. [3 marks] Output pd = V
  16. June 2022, Paper 2 Higher, Q07.3 (3 marks): The input pd causes an alternating current. Explain why there is an alternating current in the output when the transformer is connected to a circuit. [3 marks]
  17. November 2020, Paper 2 Higher, Q07.1 (2 marks): The portable power supply has an alternator connected to a transformer. The transformer can be adjusted to have different numbers of turns on the secondary coil
  18. November 2020, Paper 2 Higher, Q07.2 (3 marks): A lamp is connected to the power supply. The lamp requires an input potential difference of 5.0 V. The alternator generates a potential difference of 1.5 V. The
  19. November 2020, Paper 2 Higher, Q07.3 (5 marks): The handle of the alternator is turned, causing the coil to rotate. Explain why an alternating current is induced in the coil. [5 marks]
  20. November 2020, Paper 2 Higher, Q07.4 (1 mark): Suggest the purpose of the slip rings. [1 mark]
  21. November 2020, Paper 2 Higher, Q07.5 (3 marks): The alternator from the portable power supply is disconnected from the transformer and lamp. Explain why the handle of the alternator becomes much easier to tur
  22. June 2019, Paper 2 Higher, Q09.4 (1 mark): What is the function of a microphone? [1 mark]
  23. June 2019, Paper 2 Higher, Q09.5 (4 marks): Explain how a moving-coil microphone works. [4 marks]
  24. June 2018, Paper 2 Higher, Q03.6 (1 mark): Why does the movement of the bar magnet induce a potential difference across the coil? [1 mark]
  25. June 2018, Paper 2 Higher, Q03.7 (1 mark): Why is the induced potential difference across the coil alternating? [1 mark]
  26. June 2018, Paper 2 Higher, Q03.8 (1 mark): Figure 5 shows how the potential difference induced across the coil varies after the bar magnet has been released. Figure 5 Which statement describes the moveme
  27. June 2018, Paper 2 Higher, Q03.9 (2 marks): The seismometer cannot detect small vibrations. Suggest two changes to the design of the seismometer that would make it more sensitive to small vibrations. [2 m
  28. June 2018, Paper 2 Higher, Q07.1 (1 mark): Figure 12 contains one anomalous result. Suggest one possible reason why this anomalous result occurred. [1 mark]
  29. June 2018, Paper 2 Higher, Q07.2 (1 mark): The transformer changes from being a step-down to a step-up transformer. How can you tell from Figure 12 that this happens? [1 mark]
  30. June 2018, Paper 2 Higher, Q07.4 (5 marks): Calculate the current from the power supply needed to provide a power output of 336 W. Use the data in Figure 13. The transformer is 100% efficient. [5 marks] C
  31. Specimen, Paper 2 Higher, Q06.1: Figure 12 shows the construction of a simple transformer. Figure 12 0 6 Why is iron a suitable material for the core of a transformer? [1 mar Tick one box. It i
  32. Specimen, Paper 2 Higher, Q06.2 (1 mark): Figure 12 shows the construction of a simple transformer. Figure 12 0 6 A student makes three simple transformers, J, K and L. Figure 13 shows how the potential
  33. Specimen, Paper 2 Higher, Q06.3 (3 marks): Figure 12 shows the construction of a simple transformer. Figure 12 0 6 Each of the transformers has 50 turns on the primary coil. Calculate the number of turns

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