Which statement about electrical safety devices in mains-voltage appliances is correct?
A fuse should always be connected in series with the neutral wire.
Double-insulated appliances must be connected to an earth wire to prevent electric shocks.
If a fault causes the live wire to touch a metal casing, the earth wire allows a large-enough current to flow to melt the fuse.
A fuse is designed to prevent voltage from becoming too high.
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.