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8 Energy – forces doing work

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Question 43
F

The Figure shows the energy transfers in an electric motor in 5.0 s.

Figure

image

a.

Calculate the useful energy transferred by the motor in 5.0 s.

[1]
b.

Calculate the efficiency of the motor.

[2]
c.

Calculate the useful power output of the motor.

[2]
d.

A new motor is supplied with the same energy in 5.0 s. The efficiency of the new motor is 0.75.

Calculate how much less energy is wasted by the new motor in 5.0 s.

[2]
Markscheme

8 Energy – forces doing work Questions

  1. GCSE
  2. /Physics
  3. /8 Energy – forces doing work

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