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13.2 Transformers and the National Grid

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Question 36

Two transformers, X and Y, are each 100% efficient. The secondary circuit of X supplies the primary circuit of Y.

The table shows their operating values.

Quantity	Value
Primary potential difference of X	240 V
Secondary potential difference of X	48 V
Secondary potential difference of Y	12 V
Secondary current of Y	4.0 A

What is the primary current of X?

[1]

$A0.050\ \mathrm{A}$

$A0.20\ \mathrm{A}$

$A1.0\ \mathrm{A}$

$A4.0\ \mathrm{A}$

Markscheme

13.2 Transformers and the National Grid Questions

GCSE
Physics
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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