Many household electrical appliances are protected by both a fuse and an earth wire connected to the metal casing.
Which of the following statements is not correct?
If a fault causes the live wire to touch the metal casing, a very large current will flow down the earth wire.
The earth wire must have a low resistance to ensure the current is large enough to blow the fuse quickly.
The fuse is placed in the neutral wire so that it can blow and stop the flow of current.
Once the fuse blows, the path to the high-voltage live supply is cut off, making the appliance safe.
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.