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8.3 Power and efficiency

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Question 14

A stair lift carries a passenger to the top of a flight of stairs in 30 s. During the journey, the stair lift transfers 3600 J of energy usefully. Its efficiency is 75%. What is the mean input power of the stair lift?

[1]
A

90 W90\ \mathrm{W}90 W

B

160 W160\ \mathrm{W}160 W

C

480 W480\ \mathrm{W}480 W

D

120 W120\ \mathrm{W}120 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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