What is the safety function of a fuse in a mains electrical circuit?
to limit the voltage applied to appliances
to prevent electric shocks when a user touches the metal casing
to melt and break the circuit if the current exceeds a safe level
to store excess electrical energy during a power surge
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.