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13.2 Transformers and the National Grid

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Question 52
H

A transmission line must receive an input power of 20 MW20\ \mathrm{MW}20 MW. Its total cable resistance is 4.0 Ω.

The power dissipated in the cables must not exceed 40 kW.

What is the lowest transmission potential difference that satisfies this condition?

[1]
A

2.0 kV2.0\ \mathrm{kV}2.0 kV

B

20 kV20\ \mathrm{kV}20 kV

C

2000 kV2000\ \mathrm{kV}2000 kV

D

200 kV200\ \mathrm{kV}200 kV

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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