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8.3 Power and efficiency

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Question 5

During a test, a floor-polishing machine receives 18 kJ of energy. The energy transferred usefully is three times the energy dissipated. Its mean useful power output is 500 W. What is the duration of the test?

[1]
A

27 s27\ \mathrm{s}27 s

B

24 s24\ \mathrm{s}24 s

C

9 s9\ \mathrm{s}9 s

D

36 s36\ \mathrm{s}36 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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