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8.3 Power and efficiency

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Question 63
H

A machine dissipates 300 J for every 700 J transferred usefully. It transfers 4200 J usefully in 12 s. What is its mean input power?

[1]
A

350 W350\ \mathrm{W}350 W

B

150 W150\ \mathrm{W}150 W

C

700 W700\ \mathrm{W}700 W

D

500 W500\ \mathrm{W}500 W

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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