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3.2 Dissipation and efficiency

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Question 37
H

A heating system transfers 180 kJ usefully. Its efficiency increases from 60% to 75% after insulation is fitted.

How much less input energy is needed to transfer the same useful energy?

[1]
A

27 kJ27\ \mathrm{kJ}27 kJ

B

45 kJ45\ \mathrm{kJ}45 kJ

C

60 kJ60\ \mathrm{kJ}60 kJ

D

120 kJ120\ \mathrm{kJ}120 kJ

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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