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8.3 Power and efficiency

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Question 42
F

A machine receives 900 J of energy. It dissipates 180 J by heating and 45 J by sound. All the remaining energy is transferred usefully. What is its efficiency?

[1]
A

0.750.750.75

B

0.050.050.05

C

0.250.250.25

D

0.200.200.20

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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