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8.3 Power and efficiency

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Question 60
H

A motor produces a useful power of 240 W. Its efficiency increases from 0.60 to 0.80, with no change in useful power. What is the percentage decrease in its input power?

[1]
A

25%25\%25%

B

50%50\%50%

C

20%20\%20%

D

33%33\%33%

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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