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13.2 Transformers and the National Grid

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Question 50

Two transmission systems each receive an input power of $MW12\ \mathrm{MW}$ . The table shows their operating values.

System	Transmission potential difference / $kV\mathrm{kV}$	Total cable resistance / $Ω\Omega$
X	60	2.0
Y	120	4.0

What is the ratio of the power dissipated in the cables of X to that dissipated in the cables of Y?

[1]

$2 : 1$

$1 : 2$

$4 : 1$

$8 : 1$

Markscheme

13.2 Transformers and the National Grid Questions

GCSE
Physics
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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