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10.3 Electrical energy and power

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Question 47
H

A heating element has a resistance of 20 Ω and is connected to a constant 10 V supply. Its resistance increases to 25 Ω as it warms. Which gives the initial and final powers?

[1]
A

initial 5.0 W5.0\ \mathrm{W}5.0 W; final 4.0 W4.0\ \mathrm{W}4.0 W

B

initial 5.0 W5.0\ \mathrm{W}5.0 W; final 6.25 W6.25\ \mathrm{W}6.25 W

C

initial 2.0 W2.0\ \mathrm{W}2.0 W; final 2.5 W2.5\ \mathrm{W}2.5 W

D

initial 4.0 W4.0\ \mathrm{W}4.0 W; final 5.0 W5.0\ \mathrm{W}5.0 W

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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