0654.P4.5.09 — Recall and use the equation Vp Np = Vs Ns where p and s refer to primary and secondary: past paper questions
Real questions on 0654.p4.5.09 — recall and use the equation vp np = vs ns where p and s refer to primary and secondary
The newest 14 of 14 written questions. Open one to see it on the real paper.
- 0973/41 · October/November 2025 · Q10b(i)[1]
State the type of transformer used at power stations to supply power to the electricity network.
See it on the paper → - 0973/41 · October/November 2025 · Q10c[2]
A transformer is connected to a 230 V mains supply. An output of 3.6 V is required. The secondary coil has 720 turns. Calculate the number of turns on the primary coil. number of turns =
See it on the paper → - 0973/42 · May/June 2025 · Q11c(i)[1]
State the change made to the voltage by a step-up transformer.
See it on the paper → - 0973/42 · May/June 2025 · Q11d[2]
A step-down transformer is used near homes. The primary voltage is 30 000 V and the primary coil has 25 000 turns. The secondary coil has 90 turns. Calculate the secondary voltage. secondary voltage = V
See it on the paper → - 0973/42 · May/June 2024 · Q12b(i)[2]
The step‑up transformer contains 3000 turns on the primary coil. Calculate the number of turns on the secondary coil. number of turns =
See it on the paper → - 0973/42 · May/June 2024 · Q12b(ii)[2]
Explain why electricity is transmitted at a voltage of 132 000 V and not 25 000 V.
See it on the paper → - 0973/42 · May/June 2022 · Q12a(ii)[2]
The transformer has 17 turns on the primary coil and 8 turns on the secondary coil. Calculate the output voltage when the a.c. power supply has an e.m.f. of 34 000 V. Assume the transformer has an efficiency of 100%. output voltage = V
See it on the paper → - 0973/41 · October/November 2021 · Q12a(i)[1]
State the name of the component labelled X.
See it on the paper → - 0973/41 · October/November 2021 · Q12a(ii)[1]
Suggest a suitable material for making component X.
See it on the paper → - 0973/41 · October/November 2021 · Q12b(i)[2]
Calculate the reading on the voltmeter. voltage = V
See it on the paper → - 0973/41 · October/November 2021 · Q12b(ii)[2]
Suggest two ways to increase the reading on the voltmeter.
See it on the paper → - 0973/41 · October/November 2021 · Q12c[2]
The following statements explain how the transformer produces a reading on the voltmeter. The statements are in the wrong order. A. B. C. D. E. An alternating potential difference is applied to the primary coil. The secondary coil experiences a changing magnetic field. This produces a changing magnetic field in the pri...
See it on the paper → - 0973/41 · October/November 2020 · Q12a(ii)[2]
Calculate the number of turns on the secondary coil. number of turns =
See it on the paper → - 0973/42 · May/June 2020 · Q6c[2]
The power station generates electricity at 25 000 V. A transformer increases this voltage to 400 000 V before the electricity is transmitted over large distances through transmission cables. The number of turns on the secondary coil of the transformer is 500 000. Calculate the number of turns on the primary coil of the...
See it on the paper →
What examiners said
The correct change of an increase in voltage was generally identified.
— Examiner report, May/June 2025, 0973/42 Q11(c)(i) (Cambridge)
A common issue was with errors in the formula. Candidates that stated the correct formula generally gave the correct value of the secondary voltage of 108 V.
— Examiner report, May/June 2025, 0973/42 Q11(d) (Cambridge)
There were many successful calculations of the number of turns on the secondary coil. Errors commonly occurred in rearranging the formula.
— Examiner report, October/November 2020, 0973/41 Q12(a)(ii) (Cambridge)
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