What is the function of a fuse in an electrical circuit?
to allow a small current in one circuit to operate a switch in another circuit
to protect the circuit by melting and breaking the circuit if the current becomes too large
to prevent an electric shock by connecting a metal case to the earth
to convert alternating current to direct current
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.