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13.2 Transformers and the National Grid

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Question 6

Electrical power from a tidal barrage is transferred to a mainland substation through a cable with a total resistance of 4.0 Ω. The cable carries a power of 20 MW20\ \mathrm{MW}20 MW.

The power dissipated by heating in the cable is 40 kW.

What is the transmission potential difference?

[1]
A

50 kV50\ \mathrm{kV}50 kV

B

200 kV200\ \mathrm{kV}200 kV

C

100 kV100\ \mathrm{kV}100 kV

D

400 kV400\ \mathrm{kV}400 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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