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8.3 Power and efficiency

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Question 25

During a 30 s pressing operation, a recycling compactor has a useful power output of 420 W. The efficiency of the compactor is 70%. How much energy is supplied to the compactor during this operation?

[1]
A

8820 J8820\ \mathrm{J}8820 J

B

600 J600\ \mathrm{J}600 J

C

180 J180\ \mathrm{J}180 J

D

18 000 J18\,000\ \mathrm{J}18000 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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