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1.2 Conservation and dissipation of energy

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Question 42
F

A lamp transfers 25 J of energy from the mains supply each second. Each second, 4 J of energy is transferred usefully by light. What is the efficiency of the lamp as a percentage?

[1]
A

4 %

B

6 %

C

16 %

D

21 %

Markscheme

1.2 Conservation and dissipation of energy Questions

  1. GCSE
  2. /Physics
  3. /1.2 Conservation and dissipation of energy

104 exam-style questions on AQA GCSE Physics 1.2 Conservation and dissipation of energy, covering 1.2.1 Energy transfers in a system and 1.2.2 Efficiency. Each one has a worked solution and a mark scheme showing where the marks go.

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