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13.2 Transformers and the National Grid

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Question 24

A transformer in a photocopier wastes no energy. A current of 0.030 A enters its primary coil at 230 V. The current in the secondary circuit is 1.5 mA.

What is the secondary potential difference, in kilovolts?

[1]
A

4.6 kV4.6\ \mathrm{kV}4.6 kV

B

46 kV46\ \mathrm{kV}46 kV

C

0.0115 kV0.0115\ \mathrm{kV}0.0115 kV

D

0.23 kV0.23\ \mathrm{kV}0.23 kV

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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