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Question 9

An electric washing machine has a metal casing and is connected to a 230 V230\text{ V}230 V electricity supply.

a.

The washing machine is fitted with a 13 A13\text{ A}13 A fuse, and an earth wire is connected to its metal casing. A fault occurs and the live wire inside touches the metal casing.

Explain how the fuse and the earthed metal casing work together to protect both the user and the appliance.

[4]
b.

The control circuit of the washing machine includes a transformer.

  • The voltage supplied to the primary coil of the transformer, VpV_{\text{p}}Vp​, is 230 V230\text{ V}230 V.
  • The number of turns on the primary coil, NpN_{\text{p}}Np​, is 115011501150.
  • The number of turns on the secondary coil, NsN_{\text{s}}Ns​, is 606060.

Calculate the secondary voltage, VsV_{\text{s}}Vs​, for this transformer.

[3]
Markscheme

Electrical safety Questions

  1. IGCSE
  2. /Physics
  3. /Electrical safety

135 exam-style questions on CIE IGCSE Physics Electrical safety, covering Electrical safety. Each one has a worked solution and a mark scheme showing where the marks go.

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