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Power and efficiency

Power and efficiency

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Question 9

An electric motor has an input power of 25 kW. Its efficiency is 0.80.

Which row shows the correct values for this motor?

A

Useful output power = 5 kW5\text{ kW}5 kW, Wasted output power = 20 kW20\text{ kW}20 kW

B

Useful output power = 15 kW15\text{ kW}15 kW, Wasted output power = 10 kW10\text{ kW}10 kW

C

Useful output power = 20 kW20\text{ kW}20 kW, Wasted output power = 5 kW5\text{ kW}5 kW

D

Useful output power = 20 kW20\text{ kW}20 kW, Wasted output power = 10 kW10\text{ kW}10 kW

Markscheme

Power and efficiency Questions

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

37 exam-style questions on OCR GCSE Physics Power and efficiency. Each one has a worked solution and a mark scheme showing where the marks go.

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