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13.2 Transformers and the National Grid

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Question 49
H

Electrical power of 8.0 MW8.0\ \mathrm{MW}8.0 MW enters a transmission line at a potential difference of 100 kV100\ \mathrm{kV}100 kV. The total resistance of the cables is 5.0 Ω.

What percentage of the input power is dissipated by heating in the cables?

[1]
A

0.040%0.040\%0.040%

B

4.0%4.0\%4.0%

C

0.40%0.40\%0.40%

D

40%40\%40%

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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