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1.2 Conservation and dissipation of energy

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Question 11

During one cycle, a tumble dryer transfers 3 600 000 J3\,600\,000\ \text{J}3600000 J usefully to warm the clothes. Its efficiency for that cycle is 0.60.

a.

Calculate the total energy supplied to the dryer during this cycle.

[3]
b.

Calculate the energy wasted by the dryer during this cycle.

[1]
c.

Most of the energy wasted by the dryer is transferred by heating through its metal casing to the surroundings.

Describe two changes to the casing that would make the dryer more efficient.

[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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