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13.2 Transformers and the National Grid

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Question 53
H

A transmission line receives 10 MW10\ \mathrm{MW}10 MW at 100 kV100\ \mathrm{kV}100 kV. Its total cable resistance is 10 Ω.

The potential difference is increased to 200 kV200\ \mathrm{kV}200 kV while the input power and cable resistance remain unchanged.

How much less energy is dissipated in the cables during 2.0 hours at the higher potential difference?

[1]
A

0.15 MJ0.15\ \mathrm{MJ}0.15 MJ

B

180 MJ180\ \mathrm{MJ}180 MJ

C

540 MJ540\ \mathrm{MJ}540 MJ

D

720 MJ720\ \mathrm{MJ}720 MJ

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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