CAIE IGCSE Physics Mains Electricity Hazards

Practise identifying electric-shock and fire risks from damaged insulation, damp conditions, thin cables and overloaded sockets or extension leads.

Exam points

link bare or damaged live-wire insulation to contact with live conductors and electric shock
explain that thin or overloaded cables carry excessive current, overheat and may cause a fire
identify damp outdoor plugs or sockets as shock hazards because water provides a conducting path

[Maximum number: 4]

Fig. 7.2 shows an extension lead used to supply power to a 3 kW electric heater on a cool evening.

extension lead designed
for use with a 25 W lamp

Fig. 7.2
State and explain three dangers with this arrangement.
danger 1
danger 2
danger 3

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