The metal cases of electrical appliances are connected to an earth wire, and a fuse is connected in the circuit.
Which statement is not correct?
The fuse must be connected to the live wire.
The earth wire must have a very high resistance.
If the live wire touches the metal case, the fuse melts and breaks the circuit.
Appliances with plastic casings (double-insulated) do not require an earth wire.
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.