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13.2 Transformers and the National Grid

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Question 18
F

Electrical energy is transferred along a transmission cable.

The Figure shows how the power wasted in the cable depends on the current in the cable.

Figure

image

a.

Use the Figure to determine the power wasted when the current in the cable is 300 A.

[1]
b.

Describe how the power wasted changes when the current is doubled from 200 A to 400 A.

Use data from the Figure in your answer.

[2]
c.

Calculate the resistance of the cable.

Use your answer to (a).

[3]
d.

Explain how the Figure shows that transferring electrical energy at a high potential difference improves the efficiency of the national grid.

[3]
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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