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8.3 Power and efficiency

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Question 52
F

A machine transfers 2400 J usefully during each cycle. Its efficiency increases from 0.60 to 0.80. How much less input energy is needed for each cycle?

[1]
A

600 J600\ \mathrm{J}600 J

B

480 J480\ \mathrm{J}480 J

C

1000 J1000\ \mathrm{J}1000 J

D

1600 J1600\ \mathrm{J}1600 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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