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13.2 Transformers and the National Grid

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Question 19

A desalination works receives electrical power from a generating station through a long cable. The transformer at the generating station is ideal.

QuantityValue
Input power to transformer16 MW16\ \mathrm{MW}16 MW
Primary potential difference22 kV22\ \mathrm{kV}22 kV
Number of turns on primary coil550
Number of turns on secondary coil5500
Total resistance of cable3.0 Ω

Assume that the cable is the only part of the system in which power is dissipated.

Calculate the percentage of the electrical power entering the transformer that is received by the desalination works.

[4]
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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