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10.3 Electrical energy and power

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Question 12
F

The Figure shows a magnified view of the particles in a metal wire when there is a current in the wire.

Figure

image

a.

Give the names of the particles labelled X and Y.

[2]
b.

Explain why the temperature of the wire increases when there is a current in it.

[3]
c.

A student says:

'The energy transferred in the wire is used up.'

Explain why the student is wrong.

[2]
d.

The current in the wire is doubled. The resistance of the wire does not change.

Another student says:

'The power dissipated in the wire will also double.'

Explain why this student is wrong.

[2]
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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