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13.2 Transformers and the National Grid

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Question 24

An aluminium recycling plant receives 18 MW18\ \text{MW}18 MW of electrical power through transmission cables with a total resistance of 1.6 Ω.

The same power could be transferred at either 60 kV60\ \text{kV}60 kV or 300 kV300\ \text{kV}300 kV.

Show that transferring the power at 300 kV300\ \text{kV}300 kV instead of 60 kV60\ \text{kV}60 kV reduces the power wasted in the cables to 125\dfrac{1}{25}251​ of its value.

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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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