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13.2 Transformers and the National Grid

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Question 8

A transformer provides a supply for a miniature water pump. It is 100% efficient. The primary is connected to a 240 V supply and carries a current of 0.10 A. The secondary potential difference is 8 V. What is the secondary current in milliamperes?

[1]
A

3000 mA3000\ \mathrm{mA}3000 mA

B

24 000 mA24\,000\ \mathrm{mA}24000 mA

C

300 mA300\ \mathrm{mA}300 mA

D

100 mA100\ \mathrm{mA}100 mA

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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