Which statement explains why a safety component, such as a fuse or a circuit breaker, must be connected in the live wire of a mains electrical appliance?
The component is connected in the live wire so that if a fault occurs and the fuse melts (or circuit breaker trips), the appliance is completely isolated from the high-voltage mains supply.
The component can be placed in either the live or the neutral wire, as both wires always carry the same current and are at the same electrical potential.
The component is connected in the earth wire to ensure that any current leakage to the metal chassis immediately trips the circuit breaker.
The component is connected in the neutral wire to block the returning current and ground the appliance safely.
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.