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8.3 Power and efficiency

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Question 6

An emergency lighting unit receives an input power of 300 W. A converter in the unit is 75% efficient and supplies power to a lamp. The lamp transfers 90 W usefully as light. What is the efficiency of the lamp?

[1]
A

40%40\%40%

B

45%45\%45%

C

75%75\%75%

D

30%30\%30%

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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