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1.2 Conservation and dissipation of energy

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Question 9
H

An electric motor inside a machine becomes hot when the machine runs. Which change reduces the unwanted energy transfer from the moving parts of the machine?

[1]
A

putting oil on the bearings that the moving parts turn in

B

putting a thick layer of insulation around the whole motor

C

running the motor from a supply of higher potential difference

D

making the moving parts from a material of greater density

Markscheme

1.2 Conservation and dissipation of energy Questions

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

40 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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