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3.2 Dissipation and efficiency

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Question 38
H

A machine receives 800 J per operation. Before a change, it transfers 500 J usefully.

The change halves the wasted energy per operation. The input energy stays the same.

What is the new efficiency?

[1]
A

81.25%81.25\%81.25%

B

31.25%31.25\%31.25%

C

75.00%75.00\%75.00%

D

87.50%87.50\%87.50%

Markscheme

3.2 Dissipation and efficiency Questions

  1. GCSE
  2. /Physics
  3. /3.2 Dissipation and efficiency

100 exam-style questions on Edexcel GCSE Physics 3.2 Dissipation and efficiency, covering 3.2.1 Dissipation of energy, 3.2.2 Reducing unwanted energy transfers, 3.2.3 Efficiency, and 3.2.4 Increasing efficiency. Each one has a worked solution and a mark scheme showing where the marks go.

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