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10.3 Electrical energy and power

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Question 1

The nichrome wire of a hot-wire foam cutter dissipates power $P$ . It is replaced by a nichrome wire that is 1.5 times as long and has 3 times the cross-sectional area. The current in the new wire is twice the current in the original wire.

What is the power dissipated in the new wire?

[1]

$2 P$

$P$

$4 P$

$18 P$

Markscheme

10.3 Electrical energy and power Questions

GCSE
Physics
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.

Question bank