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  • Energy Transfers and Stores (Energy 1)
  • A machine has a useful power output of 900 W and a total ...
Multiple choice

A machine has a useful power output of 900 W and a total power input of 1200 W. Calculate the efficiency of the motor.

  1. 0.75

  2. 1.33

  3. 1080000

  4. 0.25

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A Correct answer
Explanation

Efficiency = useful power output / total power input. 900 W / 1200 W = 0.75.

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