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13.2 Transformers and the National Grid

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Question 39
F

A transformer is 100% efficient. Its secondary supplies 3.0 A at 12 V. The primary current is 0.15 A.

What is the primary potential difference?

[1]
A

0.60 V0.60\ \mathrm{V}0.60 V

B

36 V36\ \mathrm{V}36 V

C

80 V80\ \mathrm{V}80 V

D

240 V240\ \mathrm{V}240 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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