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8.3 Power and efficiency

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Question 13

While smoothing a wooden surface, an electric sander receives 12 000 J12\,000\ \mathrm{J}12000 J of energy in 20 s. Its efficiency during this interval is 0.75. What is the useful power output of the sander?

[1]
A

450 W450\ \mathrm{W}450 W

B

800 W800\ \mathrm{W}800 W

C

600 W600\ \mathrm{W}600 W

D

150 W150\ \mathrm{W}150 W

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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