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13.2 Transformers and the National Grid

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Question 8

A tidal-energy installation supplies machinery in a harbour through a subsea electrical link. At the sending station, the link operates at 120 kV120\ \mathrm{kV}120 kV and takes 18.0 MW18.0\ \mathrm{MW}18.0 MW. At the harbour, a 100% efficient transformer reduces the potential difference to 30.0 kV30.0\ \mathrm{kV}30.0 kV; its output current is 591 A.

What is the total resistance of the subsea cables?

[1]
A

788 Ω788\ \Omega788 Ω

B

1.80 kΩ1.80\ \mathrm{k}\Omega1.80 kΩ

C

0.773 Ω0.773\ \Omega0.773 Ω

D

12.0 Ω12.0\ \Omega12.0 Ω

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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