A warning on the packaging of a standard wall-mounted mains light switch reads:
SAFETY WARNING This touch-plate switch is not suitable for installation inside a wet shower room. Lights in these areas should be operated by non-conductive pull-cord switches mounted on the ceiling.
(i) Explain why it might be dangerous to operate a standard wall-mounted switch with wet hands in a shower room. (ii) Why is it safe to use a pull-cord switch in this environment?
A electric coffee maker has a normal operating current of 6 A when working normally.
The cable connected to the coffee maker has a maximum safe current limit of 10 A.
Which of the following fuses would be most suitable to use in the plug? Choose one.
The cable used to connect an electric vehicle (EV) home charger is much thicker than the cable used for a bedside lamp.
(i) Why do high-power appliances like EV chargers require a much thicker cable? (ii) What would happen to the cable if a thin lamp wire were used to connect the EV charger instead?
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.