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13.2 Transformers and the National Grid

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Question 38
F

A transformer is 100% efficient. The primary potential difference stays at 240 V and the secondary potential difference stays at 12 V.

An additional appliance is connected to the secondary circuit. The primary current increases from 0.10 A to 0.15 A.

What is the increase in the total secondary current?

[1]
A

0.050 A0.050\ \mathrm{A}0.050 A

B

1.0 A1.0\ \mathrm{A}1.0 A

C

2.0 A2.0\ \mathrm{A}2.0 A

D

3.0 A3.0\ \mathrm{A}3.0 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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