Electrical energy and electrical power: past paper questions
Real questions on electrical energy and electrical power
The newest 20 of 39 written questions. Open one to see it on the real paper.
- 0972/31 · May/June 2026 · Q4a(ii)[3]
(ii) The current in the motor is 1.2A. The potential difference (p.d.) across the motor is 24 V. Calculate the energy transferred to the motor in a time of 30s. energy transferred .......... [3]
See it on the paper → - 0972/31 · May/June 2026 · Q4a(iii)[2]
Explain one way in which energy is wasted as the electric motor turns the wheel.
See it on the paper → - 0972/32 · May/June 2026 · Q8b[6]
(b) Calculate the power of the heater. POWED ooo. .......... [3]
See it on the paper → - 0972/41 · May/June 2026 · Q7b(i)[2]
(i) Calculate the work done by the battery. WOFK CONE .......... .......... [2]
See it on the paper → - 0972/41 · May/June 2026 · Q7b(iii)[1]
Show that the current in the motor is 0.66A.
See it on the paper → - 0972/41 · May/June 2026 · Q8b(i)[3]
Calculate the energy transferred to the lawnmower in 0.75h. Give your answer in kWh. energy = kWh
See it on the paper → - 0972/41 · May/June 2026 · Q8b(ii)[1]
(ii) Calculate the cost of the energy calculated in 8(b)(i). COSt .......... [1]
See it on the paper → - 0972/42 · May/June 2026 · Q2a(i)[1]
State the direction of the force acting on the satellite.
See it on the paper → - 0972/42 · May/June 2026 · Q8a(i)[2]
8 (a) (i) Complete the definition of an ‘electric field’. electric field region Where .......... EXPELIONCES ..........
See it on the paper → - 0972/42 · May/June 2026 · Q8a(ii)[2]
(ii) Figure 8.1 shows two parallel, oppositely charged metal plates. Figure 8.1 On Figure 8.1, draw four field lines to show the pattern and the direction of the electric field between the two parallel plates. [2]
See it on the paper → - 0972/42 · May/June 2026 · Q8b(i)[1]
Identify component X.
See it on the paper → - 0972/42 · May/June 2026 · Q8b(ii)[3]
(ii) The temperature increases. The lamp lights. Complete the sentences to explain, in terms of potential difference (p.d.) and resistance, why the lamp lights. When temperature thermistor increases, .......... thermistor .......... This causes p.d. across .......... increase. magnetic field produced relay relay coil a...
See it on the paper → - 0972/31 · October/November 2025 · Q8c[4]
The potential difference (voltage) across a resistor is 64 V. The current in the resistor is 2.2 mA. Calculate the power of the resistor. power = W
See it on the paper → - 0972/31 · October/November 2025 · Q8d[3]
Calculate the cost of using the television for 6.0 hours. cost for 6 hours = cents (d) The energy used by the television in one hour is 0.14 kWh. The cost of one kWh of energy is 36 cents.
See it on the paper → - 0972/61 · October/November 2025 · Q4[1]
A student is investigating electrical heaters that are used in the school laboratory to heat beakers of water. The heaters are all 12 V heaters with the same power rating. The student thinks that some heaters are more efficient than other heaters. Plan an experiment to compare how quickly the heaters increase the tempe...
See it on the paper → - 0972/31 · May/June 2025 · Q9b[3]
The energy used by the router each hour is 0.0090 kW h. One unit (kW h) of energy costs 50 cents. Calculate the cost of using the router for 24 hours. cost for 24 hours = cents
See it on the paper → - 0972/41 · May/June 2025 · Q4b(i)[2]
Show that the current in the heater is approximately 8.7 A. (i)
See it on the paper → - 0972/41 · May/June 2025 · Q7b(ii)[3]
Calculate the energy transferred by heater A in 5.0 minutes. energy =
See it on the paper → - 0972/42 · May/June 2025 · Q7c(i)[1]
Define the kilowatt-hour (kW h) in words. (c) (i)
See it on the paper → - 0972/42 · May/June 2025 · Q7c(ii)[2]
A small lamp illuminates an electric oven. The lamp has an output power of 25 W and operates for 220 hours in one year. The p.d. across the lamp is 230 V. 1. Calculate the energy transferred by the lamp in one year. Give your answer in kW h. energy = kW h 2. Calculate the current in the lamp. current =
See it on the paper →
What examiners said
Many candidates scored full credit, but the majority did not multiply the three terms. They often only multiplied 2 terms, and a common incorrect answer was 1200 from 50 24 or 0.045 from 0.0090 50.
— Examiner report, May/June 2025, 0972/31 Q9(b) (Cambridge)
The majority of candidates recalled P = IV in words or symbols and converted kilowatts to watts to show that the current in the heater is approximately 8.7 A. A few candidates only gave an equation in numbers which was insufficient to demonstrate an understanding of the physics involved. Some weaker candidates did not convert the power to watts.
— Examiner report, May/June 2025, 0972/41 Q4(b)(i) (Cambridge)
A fully correct answer here involved recall of E = IVt and a conversion of time from minutes to seconds. Some candidates showed their working in stages, using P = IV and then E = Pt. A few candidates gained partial credit for an energy calculated without the time conversion. Some candidates incorrectly used the equation Q = It here.
— Examiner report, May/June 2025, 0972/41 Q7(b)(ii) (Cambridge)
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