Which statement correctly describes the function of an earth wire in an electrical appliance with a metal case?
to melt and break the circuit when the current exceeds a safe value
to provide a low-resistance path to the ground if the live wire touches the metal casing
to return the current back to the power supply under normal operating conditions
to store electrical energy and release it during a power cut
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.