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13.2 Transformers and the National Grid

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Question 33
F

A transformer is 100% efficient. It supplies two lamps connected in parallel. Each lamp operates at 12 V and takes a current of 0.75 A.

The primary potential difference is 240 V.

What is the primary current?

[1]
A

0.075 A0.075\ \mathrm{A}0.075 A

B

0.0375 A0.0375\ \mathrm{A}0.0375 A

C

1.5 A1.5\ \mathrm{A}1.5 A

D

30 A30\ \mathrm{A}30 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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