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3.2 Dissipation and efficiency

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Question 13
F

A motor receives 0.80 kJ of energy. It transfers 120 J by heating and 40 J by sound. All the remaining energy is transferred usefully.

What is the efficiency of the motor?

[1]
A

20%20\%20%

B

85%85\%85%

C

95%95\%95%

D

80%80\%80%

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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