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13.2 Transformers and the National Grid

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Question 42
F

A transformer is 100% efficient. Its secondary potential difference is 12 V. A motor and a lamp are connected in parallel across the secondary.

The motor takes a current of 1.5 A. The lamp transfers 6.0 W.

The primary potential difference is 240 V.

What is the primary current?

[1]
A

0.025 A0.025\ \mathrm{A}0.025 A

B

0.075 A0.075\ \mathrm{A}0.075 A

C

0.375 A0.375\ \mathrm{A}0.375 A

D

0.10 A0.10\ \mathrm{A}0.10 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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