plumiElectrical power and energy: Edexcel International A Level Physics questions
Edexcel International A Level Physics past-paper questions on 2.4.1.4 Electrical power and energy, 2019–2025, with mark schemes and examiner’s reports where available.
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Q14(b)
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All 37 questions on Electrical power and energy, as a list
- June 2025, AS Unit 2, Q14(b) (4 marks): The battery in an electric bicycle gets warm when the battery supplies power to the motor in the bicycle. Explain why the battery gets hot when the bicycle is g
- June 2025, AS Unit 2, Q16(b)(iii) (2 marks): Determine the power dissipated in the 100 Ω resistor. (2) Power =
- June 2025, AS Unit 3, Q3(b)(ii) (2 marks): Determine the output potential difference of the power supply when the power output is a maximum. (2) Output potential difference =
- January 2025, AS Unit 2, Q15(b) (3 marks): The e.m.f. of the battery was 4.5 V. The battery had negligible internal resistance. Determine the power dissipated in the circuit when the voltmeter reading wa
- January 2025, AS Unit 3, Q3(b)(i) (4 marks): Calculate the missing values for Pout and % efficiency. (4) Pout = mW Efficiency = %
- October 2024, AS Unit 2, Q10 (1 mark): The circuit shows a cell connected to two resistors. The cell has negligible internal resistance. 1.5 V 20 Ω 30 Ω Which of the following expressions gives the p
- October 2024, AS Unit 2, Q14(b) (3 marks): Determine the power of the LED when the p.d. across the LED was 2.2 V. (3) Power =
- October 2024, AS Unit 3, Q2(a)(iii) (4 marks): The student had a choice of resistors to use for the resistor R, as shown in the table. Resistor A B C D Resistance / Ω 18 18 33 33 Maximum power / W 0.5 2.0 0.
- June 2024, AS Unit 2, Q14(c) (2 marks): The power output of the heating system can be changed by connecting more panels in parallel with the power supply, as shown. heating panel Explain how adding pa
- June 2024, AS Unit 2, Q14(d) (5 marks): A student designs a heating system using five heating panels, as shown. conducting material 24 V 1.60 m 51 cm To be safe, the maximum power of the student’s hea
- January 2024, AS Unit 2, Q16(b) (2 marks): During a lightning strike, there was a potential difference (p.d.) of 1.5 × 10 4 A in between the metal rod and the ground. This p.d. caused a current of 1.2 ×
- January 2024, AS Unit 2, Q18(a)(i) (2 marks): Derive the equation P = V R (2)
- January 2024, AS Unit 2, Q18(a)(ii) (4 marks): Determine the potential difference across the battery. (4) Potential difference =
- January 2024, AS Unit 2, Q19(c) (5 marks): A student connected two solar cells in series with a 4.0 Ω resistor as shown. solar cell 4.0 Ω The student adjusted the light conditions so that each solar cell
- January 2024, AS Unit 3, Q2(a) (2 marks): The motor was connected in a circuit including a battery and a switch. The student connected additional components to determine the power of the motor. Complete
- January 2024, AS Unit 3, Q2(c) (3 marks): Explain how the measurements made by the student should be used to determine the efficiency of the motor as it lifts the mass. (3)
- June 2023, AS Unit 2, Q14 (6 marks): *14 The circuit shown contains a fixed resistor and a light dependent resistor (LDR). Explain why the power dissipated by the whole circuit changes as the inten
- June 2023, AS Unit 2, Q16(a) (3 marks): Determine the minimum potential difference for which the headlight will emit light. (3) Minimum potential difference = V
- January 2023, AS Unit 2, Q14(a)(ii) (3 marks): Calculate the power dissipated by the thermistor. (3) Power =
- January 2023, AS Unit 2, Q17(c) (3 marks): The student suggested that the power dissipated by the internal resistance r decreases as R increases. Comment on the student’s suggestion. No further calculati
- October 2022, AS Unit 2, Q17(a)(i) (2 marks): Show that the power of the LED was about 0.1 W. (2)
- June 2022, AS Unit 2, Q12(b)(ii) (2 marks): Explain how decreasing the temperature of the thermistor affects the power dissipated by the 2.0 kΩ resistor. Do not include calculations in your answer. (2)
- January 2022, AS Unit 2, Q17(b) (4 marks): Another resistor, Y, is added to the circuit as shown. 12 V Y 3.0 Ω 4.0 Ω 6.0 Ω The student wrote the following statement. When resistor Y is added, the resista
- January 2022, AS Unit 3, Q2(a) (2 marks): The student built a circuit to vary the power of the bulb. The student used an ammeter and voltmeter to determine the power of the bulb. Draw a circuit diagram
- October 2021, AS Unit 2, Q13(a) (4 marks): Calculate the length of the wire in the filament. (4) Length of wire =
- October 2021, AS Unit 2, Q13(b) (3 marks): A student has two filament lamps. Lamp A is marked 12 V 60 W and lamp B is marked 12 V 30 W. The student sets up the circuit shown. 24 V A B The student states
- June 2021, AS Unit 2, Q18(b) (4 marks): A student suggests that the maximum power output from the resistors in this circuit will be greater than 12 W. Assess whether the student’s suggestion is correc
- June 2021, AS Unit 2, Q18(c)(ii) (3 marks): After switch Y had been closed for a few minutes, the power dissipated by the resistor decreased. Explain why. (3)
- January 2021, AS Unit 2, Q19(b)(ii) (3 marks): Calculate the power dissipated from the nichrome wire to the surroundings when the length of the wire is 0.75 m. (3) Power dissipated =
- January 2021, AS Unit 2, Q20(c) (3 marks): The display of the smart meter in one household is shown. This shows the total electrical energy used in one day. 1 kW h is a unit of energy equivalent to 1 kW
- October 2020, AS Unit 2, Q4 (1 mark): Which of the following statements about physical quantities or units is correct? A Current is a derived quantity. B Power is a derived quantity. C The coulomb i
- October 2020, AS Unit 2, Q18(a) (6 marks): Determine the power dissipated in each of the resistors. resistance of each resistor = 2.0 Ω (6)
- October 2020, AS Unit 2, Q18(b) (2 marks): Explain, without further calculation, what would happen to the power dissipated by resistor A if resistor D were disconnected from the circuit. (2)
- January 2020, AS Unit 2, Q17(c) (4 marks): With use, the internal resistance of a battery will increase. Eventually the power available from a battery will become too small to be useful. The student calc
- January 2020, AS Unit 2, Q18(b)(ii) (2 marks): Calculate the power dissipated by the lightning strike. (2) Power dissipated =
- June 2019, AS Unit 2, Q15(c)(i) (3 marks): In normal daylight, this particular type of LDR has a resistance of 670 ȍ. Calculate the power dissipated in the fixed resistor in normal daylight. resistance o
- June 2019, AS Unit 2, Q19(c) (4 marks): In a separate experiment two resistors, with equal resistance R, are connected to a battery (with internal resistance r) with the two resistors firstly in a ser
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