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4.5.6a Construction and operation of a transformer

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Question 25

A step-down transformer is used at a local substation to reduce the high transmission voltage to a lower voltage suitable for a residential area.

a.

Explain how the transformer produces this lower output voltage.

[4]
b.

Electricity is distributed to homes via overhead cables.

Explain why the power lost as heat in these cables increases significantly when the current flowing through them is increased.

[2]
c.

Explain one advantage and one disadvantage of replacing standard transmission cables with cables of a larger cross-sectional area.

[2]
Markscheme

4.5.6a Construction and operation of a transformer Questions

  1. IGCSE
  2. /Physics
  3. /4.5.6a Construction and operation of a transformer

136 exam-style questions on CIE IGCSE Physics 4.5.6a Construction and operation of a transformer. Each one has a worked solution and a mark scheme showing where the marks go.

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