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1.2 Conservation and dissipation of energy

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Question 14

Two electric hotplates are being used to heat identical pans. Each hotplate receives 1000 J of energy from the electricity supply every second. In each second, hotplate P transfers 750 J usefully to its pan and hotplate Q transfers 600 J usefully to its pan. Which statement is correct?

[1]
A

hotplate Q is more efficient, because it transfers more energy by heating to the surroundings

B

hotplate Q is more efficient, because it transfers less energy to its pan each second

C

the hotplates are equally efficient, because no energy is destroyed in either hotplate

D

hotplate P is more efficient, because a greater proportion of its input energy is transferred usefully

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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