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13.2 Transformers and the National Grid

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Question 5

In a plant propagation room, a transformer supplies a water-circulation pump and a dehumidifier connected in parallel. The transformer is 100% efficient. Its primary potential difference is 240 V and its primary current is 0.25 A. The secondary potential difference is 20 V, and the pump takes a current of 1.2 A.

What is the power transferred by the dehumidifier?

[1]
A

30 W30\ \mathrm{W}30 W

B

36 W36\ \mathrm{W}36 W

C

60 W60\ \mathrm{W}60 W

D

24 W24\ \mathrm{W}24 W

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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