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10.4 Mains electricity

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Question 31
H

Three wires P, Q and R are tested in a normally operating mains installation. One is known to be live, one neutral and one earth.

The potential differences are approximately 230 V between P and Q, 230 V between P and R, and 0 V between Q and R.

Which conclusion follows from these readings alone?

[1]
A

P is live, and Q must be neutral.

B

P is neutral, and Q must be live.

C

P is earth, and R must be neutral.

D

P is live, but Q and R cannot be distinguished.

Markscheme

10.4 Mains electricity Questions

  1. GCSE
  2. /Physics
  3. /10.4 Mains electricity

81 exam-style questions on Edexcel GCSE Physics 10.4 Mains electricity, covering 10.4.1 Direct and alternating current, 10.4.2 Live, neutral and earth wires; safety, 10.4.3 Mains wire potential differences and dangers, and 10.4.4 Power ratings and energy use. Each one has a worked solution and a mark scheme showing where the marks go.

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