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4.5.6a Construction and operation of a transformer

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Question 37

The electricity supplied to a region is transmitted using a high-voltage cable. A transformer in the local substation has a soft-iron core.

a.

Explain the principle of operation of a simple electromagnetic iron-cored transformer.

[4]
b.

The transformer steps the supply voltage down from 132 000 V132\,000\text{ V}132000 V to 11 000 V11\,000\text{ V}11000 V.

There are 350350350 turns on the secondary coil. Calculate the number of turns on the primary coil.

[2]
c.

The transformer steps the supply voltage down from 132 000 V132\,000\text{ V}132000 V to 11 000 V11\,000\text{ V}11000 V.

The electrical power transferred to the transformer by the high-voltage cable is 66 MW66\text{ MW}66 MW. Calculate the current in the primary coil.

[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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