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1.2 Conservation and dissipation of energy

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Question 36

A battery torch transfers 45 J of energy as light. A further 15 J is transferred to the thermal store of the surroundings. How much of the total energy transferred by the torch is transferred usefully, as a percentage?

[1]
A

25 %

B

75 %

C

50 %

D

33 %

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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