0654.P4.2.05 — Recall and use the equation for electrical power P = IV: past paper questions
Real questions on 0654.p4.2.05 — recall and use the equation for electrical power p = iv
The newest 9 of 9 written questions. Open one to see it on the real paper.
- 0973/41 · May/June 2026 · Q10b(i)[2]
(i) The current in the heater is 2.5A. The potential difference across the heater is 12V. Calculate the power of the heater. POWED .......... [2]
See it on the paper → - 0973/31 · October/November 2025 · Q12c(i)[2]
The washing machine uses 2500 W of power when switched on. Calculate the current in the washing machine. current = A
See it on the paper → - 0973/41 · May/June 2025 · Q12c(i)[2]
A computer projector has a power rating of 750 W. Mains potential difference is 230 V. Calculate the electric current in the projector. current = A
See it on the paper → - 0973/41 · October/November 2024 · Q12c(i)[2]
The lamp uses a current of 3.0 A and has a power output of 36 W. Calculate the potential difference across the lamp. potential difference = V
See it on the paper → - 0973/42 · May/June 2024 · Q3c(iii)[4]
The tracker unit uses a battery with an electromotive force (e.m.f.) of 11 V that provides a power output of 22 mW. The battery can transfer a total charge of 24 000 C before it needs replacing. Calculate the time for which the battery operates before it needs replacing. time = s
See it on the paper → - 0973/42 · May/June 2022 · Q6c(iii)[2]
The potential difference across each lamp is 240 V. Calculate the power output of each lamp. power = W
See it on the paper → - 0973/42 · May/June 2020 · Q6b[2]
The nuclear fuel releases 8.6 × 10 13 J of energy. From this, only 3.2 × 10 13 J of electrical energy is generated. Calculate the efficiency of this generation process. efficiency = %
See it on the paper → - 0973/42 · May/June 2020 · Q6d[2]
When electricity has been generated at the power station the voltage is increased by a transformer to reduce power losses in the transmission cables. Explain why power losses in cables are lower when the voltage is high.
See it on the paper → - 0973/41 · May/June 2019 · Q3a(ii)[2]
Calculate the power used by the lamp. Show your working. power = W
See it on the paper →
What examiners said
Many candidates correctly calculated the electrical current. The most common error was the inversion of the formula to I = V / P.
— Examiner report, May/June 2025, 0973/41 Q12(c)(i) (Cambridge)
Most candidates could use the formula P = IV to calculate the power.
— Examiner report, May/June 2019, 0973/41 Q3(a)(ii) (Cambridge)
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