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4.5.6a Construction and operation of a transformer

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Question 5

A student notices that the mains cable of a smart speaker has been damaged, exposing the copper wires inside.

a.

State the hazard of touching an exposed live wire of a damaged power cable.

[1]
b.

Explain how a fuse protects an electrical appliance when a fault causes a very large current to flow.

[3]
c.

The power adapter for the smart speaker uses a transformer to reduce the voltage of the mains electricity supply.

  • The input (primary) voltage is 220 V220\text{ V}220 V.
  • The input (primary) coil has 110011001100 turns and the output (secondary) coil has 454545 turns.

Calculate the output (secondary) voltage from the transformer.

output (secondary) voltage = ............................................................ V\text{V}V

[3]
d.

State the name of the material used in the core of the transformer.

[1]
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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