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8.3 Power and efficiency

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Question 33
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

8.3 Power and efficiency Questions

  1. GCSE
  2. /Physics
  3. /8.3 Power and efficiency

128 exam-style questions on Edexcel GCSE Physics 8.3 Power and efficiency, covering 8.3.1 Power and 8.3.2 Efficiency. Each one has a worked solution and a mark scheme showing where the marks go.

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