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13.2 Transformers and the National Grid

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Question 5

A transformer in a railway signalling test unit operates with no energy wasted. A technician records these results.

QuantityRecorded value
primary potential difference240 V
secondary potential difference60 V
primary current0.025 A
secondary current1.2 A

The potential differences and the secondary current are correct. The technician's entry for the primary current is incorrect.

By what factor is the actual primary current greater than the value in the technician's record?

[1]
A

121212

B

192192192

C

444

D

484848

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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