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8.3 Power and efficiency

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Question 22

During a cleaning task, an electric floor polisher is supplied with 9000 J of energy. Its efficiency is 0.60 and its useful power output is 180 W. For how long does the floor polisher operate?

[1]
A

20 s20\ \mathrm{s}20 s

B

50 s50\ \mathrm{s}50 s

C

30 s30\ \mathrm{s}30 s

D

83 s83\ \mathrm{s}83 s

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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