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3.2 Dissipation and efficiency

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Question 41
H

A motor drives a lifting mechanism. The mechanism is 75% efficient. The overall efficiency from energy supplied to the motor to useful energy gained by the load is 60%.

All useful output from the motor enters the lifting mechanism.

What is the efficiency of the motor?

[1]
A

45%45\%45%

B

65%65\%65%

C

80%80\%80%

D

125%125\%125%

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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