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13.2 Transformers and the National Grid

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Question 51
H

An ideal transformer transfers 24 MW24\ \mathrm{MW}24 MW from a power station to transmission cables. The primary potential difference is 20 kV20\ \mathrm{kV}20 kV and the primary coil has 500 turns. The secondary coil has 10000 turns.

The total resistance of the transmission cables is 8.0 Ω.

What is the power dissipated by heating in the cables?

[1]
A

0.48 kW0.48\ \mathrm{kW}0.48 kW

B

28.8 kW28.8\ \mathrm{kW}28.8 kW

C

576 kW576\ \mathrm{kW}576 kW

D

11520 kW11520\ \mathrm{kW}11520 kW

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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