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10.3 Electrical energy and power

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Question 35
H

A cable has a resistance of 0.80 Ω and carries a current of 5.0 A. It is replaced by a cable of resistance 0.20 Ω, carrying the same current. How much less energy is dissipated in 3.0 min?

[1]
A

3600 J3600\ \mathrm{J}3600 J

B

900 J900\ \mathrm{J}900 J

C

540 J540\ \mathrm{J}540 J

D

2700 J2700\ \mathrm{J}2700 J

Markscheme

10.3 Electrical energy and power Questions

  1. GCSE
  2. /Physics
  3. /10.3 Electrical energy and power

105 exam-style questions on Edexcel GCSE Physics 10.3 Electrical energy and power, covering 10.3.1 The heating effect of an electric current, 10.3.2 Reducing energy transfer in wires, 10.3.3 Advantages and disadvantages of the heating effect, 10.3.4 Energy transferred by an electrical circuit, 10.3.5 Electrical power, and 10.3.6 Energy transfers in domestic devices. Each one has a worked solution and a mark scheme showing where the marks go.

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