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13.2 Transformers and the National Grid

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Question 11

A transformer supplies a portable inspection lamp. During a test, 18 kJ of energy is transferred into the primary circuit. The transformer is 100% efficient, and the lamp operates at 20 V with a current of 3.0 A.

How long does the lamp operate for?

[1]
A

30 s30\ \mathrm{s}30 s

B

300 s300\ \mathrm{s}300 s

C

900 s900\ \mathrm{s}900 s

D

6000 s6000\ \mathrm{s}6000 s

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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