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3.2 Dissipation and efficiency

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Question 2

An electric fan receives the same input energy before and after a modification. Its efficiency increases from 30% to 50%.

What percentage of the energy dissipated before the modification is dissipated after it?

[1]
A

28.6%28.6\%28.6%

B

71.4%71.4\%71.4%

C

50.0%50.0\%50.0%

D

70.0%70.0\%70.0%

Markscheme

3.2 Dissipation and efficiency Questions

  1. GCSE
  2. /Physics
  3. /3.2 Dissipation and efficiency

100 exam-style questions on Edexcel GCSE Physics 3.2 Dissipation and efficiency, covering 3.2.1 Dissipation of energy, 3.2.2 Reducing unwanted energy transfers, 3.2.3 Efficiency, and 3.2.4 Increasing efficiency. Each one has a worked solution and a mark scheme showing where the marks go.

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