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13.2 Transformers and the National Grid

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Question 3

A railway signalling laboratory checks two transformers used in a test unit. The transformers operate using alternating current.

TransformerIntended typePrimary potential differencePossible secondary potential differences
Pstep-down230 V24 V or 460 V
Qstep-up8 V4 V or 80 V

Which pair of secondary potential differences is consistent with both transformers operating as intended?

[1]
A

P: 460 V460\ \mathrm{V}460 V; Q: 4 V4\ \mathrm{V}4 V

B

P: 24 V24\ \mathrm{V}24 V; Q: 4 V4\ \mathrm{V}4 V

C

P: 460 V460\ \mathrm{V}460 V; Q: 80 V80\ \mathrm{V}80 V

D

P: 24 V24\ \mathrm{V}24 V; Q: 80 V80\ \mathrm{V}80 V

Markscheme

13.2 Transformers and the National Grid Questions

  1. GCSE
  2. /Physics
  3. /13.2 Transformers and the National Grid

108 exam-style questions on Edexcel GCSE Physics 13.2 Transformers and the National Grid, covering 13.2.1 Transformers and induction, 13.2.2 The transformer turns-ratio equation, 13.2.3 The National Grid, 13.2.4 The transformer power equation, and 13.2.5 Advantages of high-voltage transmission. Each one has a worked solution and a mark scheme showing where the marks go.

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