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8.3 Power and efficiency

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Question 65
H

A motor with an efficiency of 0.80 drives a machine. The machine transfers 60% of the energy it receives usefully. The final useful energy transferred is 960 J. How much energy is dissipated by the motor alone?

[1]
A

640 J640\ \mathrm{J}640 J

B

240 J240\ \mathrm{J}240 J

C

400 J400\ \mathrm{J}400 J

D

1040 J1040\ \mathrm{J}1040 J

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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