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13.2 Transformers and the National Grid

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Question 4

A transformer in an automatic greenhouse ventilation system is 100% efficient. The secondary potential difference is 18 V and the secondary current is 0.40 A.

What is the input power?

[1]
A

18.4 W18.4\ \mathrm{W}18.4 W

B

7.2 W7.2\ \mathrm{W}7.2 W

C

0.022 W0.022\ \mathrm{W}0.022 W

D

45 W45\ \mathrm{W}45 W

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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