A household electrical appliance with a metal outer casing is connected to the mains supply. The appliance is protected by both an earth wire and a fuse.
Which statement is not correct?
The fuse must be connected to the live wire.
The earth wire must have a very low electrical resistance.
When a fault occurs, the earth wire carries a safe, low current to the ground to keep the fuse from blowing.
The surge of large current through the live wire causes the fuse to melt and break the circuit.
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.