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8.3 Power and efficiency

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Question 27

A motor rotates a theatre stage into position. An energy meter records the total energy supplied to the motor.

ReadingStartFinish
clock time14:27:3514:29:05
energy meter reading / kJ\mathrm{kJ}kJ318.4374.8

While the stage is rotating, 20.4 kJ of energy is dissipated into the thermal energy stores of the motor and the surroundings.

Calculate the mean useful power output of the motor.

[4]
Markscheme

8.3 Power and efficiency Questions

  1. GCSE
  2. /Physics
  3. /8.3 Power and efficiency

128 exam-style questions on Edexcel GCSE Physics 8.3 Power and efficiency, covering 8.3.1 Power and 8.3.2 Efficiency. Each one has a worked solution and a mark scheme showing where the marks go.

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