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1.2 Conservation and dissipation of energy

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Question 32

A ventilation fan is switched on for a short time. During this time, 900 J of energy is transferred electrically to the fan. The fan transfers 630 J of this energy usefully to the kinetic store of the moving air.

a.

Calculate the energy dissipated by the fan.

[1]
b.

The energy dissipated by the fan is not destroyed.

Explain what happens to this energy and why it is difficult to use again.

[2]
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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