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3 Conservation of energy

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Question 94
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 Conservation of energy Questions

  1. GCSE
  2. /Physics
  3. /3 Conservation of energy

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