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8.3 Power and efficiency

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Question 47
F

A motor has a useful power output of 120 W and an efficiency of 0.75. It operates for 30 s. What is the total energy supplied to the motor?

[1]
A

1200 J1200\ \mathrm{J}1200 J

B

4800 J4800\ \mathrm{J}4800 J

C

3600 J3600\ \mathrm{J}3600 J

D

2700 J2700\ \mathrm{J}2700 J

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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