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13.2 Transformers and the National Grid

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Question 10

A transformer in a theatre control system transfers 46 W from its secondary coil. Its primary coil is connected across a 230 V alternating supply. The transformer is 100% efficient.

What is the primary current?

[1]
A

46 A46\ \mathrm{A}46 A

B

5.0 A5.0\ \mathrm{A}5.0 A

C

0.20 A0.20\ \mathrm{A}0.20 A

D

10 580 A10\,580\ \mathrm{A}10580 A

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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