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13.2 Transformers and the National Grid

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Question 54
H

A transmission line receives 5.0 MW5.0\ \mathrm{MW}5.0 MW at 50 kV50\ \mathrm{kV}50 kV. The total cable resistance is 10 Ω.

All the power remaining at the far end enters a 100% efficient transformer. This transformer supplies a local network at 10 kV10\ \mathrm{kV}10 kV.

What is the current supplied to the local network?

[1]
A

490 A490\ \mathrm{A}490 A

B

10 A10\ \mathrm{A}10 A

C

100 A100\ \mathrm{A}100 A

D

500 A500\ \mathrm{A}500 A

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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