What is the primary purpose of the earth wire connected to the metal case of an electrical appliance?
to complete the circuit for normal operation
to prevent the casing from becoming live and causing an electric shock if a fault occurs
to limit the maximum electrical current flowing through the appliance
to reduce the total consumption of electrical energy
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.