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8.3 Power and efficiency

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Question 7

In an electric scooter, a controller with an efficiency of 0.80 supplies energy to a motor. During a short interval, the controller dissipates 300 J. All the energy transferred usefully by the controller is supplied to the motor, which has an efficiency of 0.65. How much energy does the motor transfer usefully during this interval?

[1]
A

780 J780\ \mathrm{J}780 J

B

1200 J1200\ \mathrm{J}1200 J

C

975 J975\ \mathrm{J}975 J

D

195 J195\ \mathrm{J}195 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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