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Power: OCR A‑Level Physics A questions

Every OCR A-Level Physics A exam question on 3.3.3 Power, 2016–2025, with its mark scheme and examiner’s report.

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1,877 questions

  1. Q23(a)

    June 2025 · AS Paper 1

    3 marks3.3.3 Power4.2.5 Power
    The whole paper ↗
    June 2025 AS Paper 1, question 23(a): Calculate the percentage efficiency of the microwave oven. percentage efficiency = % [3]

  2. Q23(b)

    June 2025 · AS Paper 1

    3 marks3.3.3 Power
    The whole paper ↗
    June 2025 AS Paper 1, question 23(b): The microwave oven is used to heat some soup. The internal energy of the soup needs to increase by 100 kJ to reach the correct temperature for eating. The soup

  3. Q5(b)(i)

    June 2025 · AS Paper 2

    2 marks3.3.3 Power
    The whole paper ↗
    June 2025 AS Paper 2, question 5(b)(i): The equation relating power P to force F and velocity v is P = Fv. Derive this equation from first principles. [2]

  4. Q5(b)(iii)

    June 2025 · AS Paper 2

    2 marks3.3.3 Power
    The whole paper ↗
    June 2025 AS Paper 2, question 5(b)(iii): Calculate the total power P needed to push the trolley up the slope at a constant speed of 0.75 m s–1. P = W [2] 14

  5. Q16(b)

    June 2024 · Paper 1

    3 marks3.3.3 Power
    The whole paper ↗
    June 2024 Paper 1, question 16(b): The car is now moving along a straight, level track. The engine of the car delivers a maximum power of 75 kW. Calculate the maximum speed of the car. maximum sp

  6. Q16(c)

    June 2024 · Paper 1

    2 marks3.3.3 Power
    The whole paper ↗
    June 2024 Paper 1, question 16(c): Changes are made to the engine of the car so that it can produce double the original maximum power. Explain why the maximum speed of the modified car is not dou

  7. Q22(a)

    June 2024 · AS Paper 1

    3 marks3.3.3 Power
    The whole paper ↗
    June 2024 AS Paper 1, question 22(a): The technician pulls a box using a rope with a force of 32 N. The force acts at an angle of 50° to the horizontal. The box moves a horizontal distance of 3.5 m

  8. Q19(b)(i)

    June 2023 · Paper 1

    2 marks3.3.3 Power
    The whole paper ↗
    June 2023 Paper 1, question 19(b)(i): Calculate the average power required to raise the bridge to a vertical position in 90 s. power W [2]

  9. Q19(b)(ii)

    June 2023 · Paper 1

    1 mark3.3.3 Power
    The whole paper ↗
    June 2023 Paper 1, question 19(b)(ii): Suggest why the actual electric motor used to lift the bridge has a maximum power output several times larger than the value calculated in (b)(i). [1]

  10. Q3(c)(i)

    June 2023 · Paper 3

    2 marks3.3.3 Power
    The whole paper ↗
    June 2023 Paper 3, question 3(c)(i): By calculating the area between the curve and the horizontal axis, estimate the total energy received by the telescope in one full rotation of the pulsar. total

  11. Q5(b)

    June 2023 · Paper 3

    2 marks3.3.3 Power
    The whole paper ↗
    June 2023 Paper 3, question 5(b): The total stored energy must be released in a time of less than 1 millisecond. Explain, using a calculation, why the lasers are powered by the network of capaci

  12. Q6

    June 2023 · AS Paper 1

    1 mark3.3.3 Power
    The whole paper ↗
    June 2023 AS Paper 1, question 6: The diagram shows a motor pulling a load along a flat, horizontal surface. The load is connected to the motor by a string at an angle of 15° to the surface. The

  13. Q17(a)

    June 2022 · Paper 1

    1 mark3.3.3 Power
    The whole paper ↗
    June 2022 Paper 1, question 17(a): The engine is initially at rest on long horizontal rails. Show that the minimum time taken for the engine to reach its maximum speed is about 1 minute. [1]

  14. Q17(b)

    June 2022 · Paper 1

    3 marks3.3.3 Power
    The whole paper ↗
    June 2022 Paper 1, question 17(b): The engine is moving along the horizontal rails at the constant maximum speed of 42 m s–1. The weight of the engine is W, the total normal contact force from th

  15. Q5

    June 2022 · AS Paper 1

    1 mark3.3.3 Power
    The whole paper ↗
    June 2022 AS Paper 1, question 5: A car of mass 1000 kg is travelling on a straight and horizontal road. The driver applies the brakes. The speed of the car decreases from 20 m s–1 to 15 m s–1 i

  16. Q11

    June 2022 · AS Paper 1

    1 mark3.3.3 Power
    The whole paper ↗
    June 2022 AS Paper 1, question 11: An electric motor is used to lift a weight of 4.0 N through a vertical height of 0.90 m in 1.8 s. The efficiency of the motor is 20%. What is the electrical pow

  17. Q10

    November 2021 · Paper 1

    1 mark3.3.3 Power
    The whole paper ↗
    November 2021 Paper 1, question 10: An object of mass 0.12 kg is lifted through a height of 0.60 m at a constant speed 3.0 m s–1. What is the minimum power needed to lift the object? A 0.36 W B 0.

  18. Q1(a)(iii)

    November 2021 · Paper 3

    5 marks3.3.3 Power
    The whole paper ↗
    November 2021 Paper 3, question 1(a)(iii): The speed of the train is v. During one period of its journey, the train accelerates from v = 30 m s–1 to v = 60 m s–1. The graph of F against v for this period

  19. Q4(d)

    November 2020 · Paper 3

    4 marks4.4.1 Wave motion3.3.3 Power
    The whole paper ↗
    November 2020 Paper 3, question 4(d): The ISS has arrays of solar cells on its wings. These solar cells charge batteries which power the ISS. The wings always face the Sun. Use the data below and yo

  20. Q3(c)

    June 2019 · Paper 3

    6 marks3.3.3 Power6.1.2 Energy
    The whole paper ↗
    June 2019 Paper 3, question 3(c): In the torch, the gravitational potential energy of the magnet is converted into electrical energy supplied to the 50 mW LED. You are asked to investigate wheth
All 27 questions on Power, as a list
  1. June 2025, AS Paper 1, Q23(a) (3 marks): Calculate the percentage efficiency of the microwave oven. percentage efficiency = % [3]
  2. June 2025, AS Paper 1, Q23(b) (3 marks): The microwave oven is used to heat some soup. The internal energy of the soup needs to increase by 100 kJ to reach the correct temperature for eating. The soup
  3. June 2025, AS Paper 2, Q5(b)(i) (2 marks): The equation relating power P to force F and velocity v is P = Fv. Derive this equation from first principles. [2]
  4. June 2025, AS Paper 2, Q5(b)(iii) (2 marks): Calculate the total power P needed to push the trolley up the slope at a constant speed of 0.75 m s–1. P = W [2] 14
  5. June 2024, Paper 1, Q16(b) (3 marks): The car is now moving along a straight, level track. The engine of the car delivers a maximum power of 75 kW. Calculate the maximum speed of the car. maximum sp
  6. June 2024, Paper 1, Q16(c) (2 marks): Changes are made to the engine of the car so that it can produce double the original maximum power. Explain why the maximum speed of the modified car is not dou
  7. June 2024, AS Paper 1, Q22(a) (3 marks): The technician pulls a box using a rope with a force of 32 N. The force acts at an angle of 50° to the horizontal. The box moves a horizontal distance of 3.5 m
  8. June 2023, Paper 1, Q19(b)(i) (2 marks): Calculate the average power required to raise the bridge to a vertical position in 90 s. power W [2]
  9. June 2023, Paper 1, Q19(b)(ii) (1 mark): Suggest why the actual electric motor used to lift the bridge has a maximum power output several times larger than the value calculated in (b)(i). [1]
  10. June 2023, Paper 3, Q3(c)(i) (2 marks): By calculating the area between the curve and the horizontal axis, estimate the total energy received by the telescope in one full rotation of the pulsar. total
  11. June 2023, Paper 3, Q5(b) (2 marks): The total stored energy must be released in a time of less than 1 millisecond. Explain, using a calculation, why the lasers are powered by the network of capaci
  12. June 2023, AS Paper 1, Q6 (1 mark): The diagram shows a motor pulling a load along a flat, horizontal surface. The load is connected to the motor by a string at an angle of 15° to the surface. The
  13. June 2022, Paper 1, Q17(a) (1 mark): The engine is initially at rest on long horizontal rails. Show that the minimum time taken for the engine to reach its maximum speed is about 1 minute. [1]
  14. June 2022, Paper 1, Q17(b) (3 marks): The engine is moving along the horizontal rails at the constant maximum speed of 42 m s–1. The weight of the engine is W, the total normal contact force from th
  15. June 2022, AS Paper 1, Q5 (1 mark): A car of mass 1000 kg is travelling on a straight and horizontal road. The driver applies the brakes. The speed of the car decreases from 20 m s–1 to 15 m s–1 i
  16. June 2022, AS Paper 1, Q11 (1 mark): An electric motor is used to lift a weight of 4.0 N through a vertical height of 0.90 m in 1.8 s. The efficiency of the motor is 20%. What is the electrical pow
  17. November 2021, Paper 1, Q10 (1 mark): An object of mass 0.12 kg is lifted through a height of 0.60 m at a constant speed 3.0 m s–1. What is the minimum power needed to lift the object? A 0.36 W B 0.
  18. November 2021, Paper 3, Q1(a)(iii) (5 marks): The speed of the train is v. During one period of its journey, the train accelerates from v = 30 m s–1 to v = 60 m s–1. The graph of F against v for this period
  19. November 2020, Paper 3, Q4(d) (4 marks): The ISS has arrays of solar cells on its wings. These solar cells charge batteries which power the ISS. The wings always face the Sun. Use the data below and yo
  20. June 2019, Paper 3, Q3(c) (6 marks): In the torch, the gravitational potential energy of the magnet is converted into electrical energy supplied to the 50 mW LED. You are asked to investigate wheth
  21. June 2019, AS Paper 1, Q13 (1 mark): The frictional force acting on an object falling vertically through water is directly proportional to its speed squared. What is the correct relationship betwee
  22. June 2018, Paper 1, Q18(b)(ii) (2 marks): The input power to the wind turbine is 1.2 MW when the wind speed is 8.0 m s−1. The density of air is 1.3 kg m−3. Calculate the length L of the turbine blades.
  23. June 2018, Paper 1, Q18(b)(iii) (2 marks): A wind farm is required to produce an output power of 50 MW when the average wind speed is 8.0 m s−1. The efficiency of each wind turbine is 42%. Calculate the
  24. June 2018, AS Paper 2, Q2 (6 marks): 2* A student wishes to determine experimentally the efficiency of a small low-voltage DC motor. The motor is used to lift light loads. Describe with the aid of
  25. June 2017, Paper 1, Q16(c) (2 marks): Calculate the useful work done on the car and hence the percentage efficiency of the jack. efficiency = % [2]
  26. June 2017, Paper 1, Q20(a) (2 marks): Calculate the total energy supplied by the heater during the time of 4.0 minutes. energy = J [2]
  27. June 2016, AS Paper 1, Q1 (1 mark): The watt is the SI unit for power. Which is the correct definition for the watt? A watt is .... A the rate of work done. B the work done per second. C a joule p

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