An electrician is holding a mains-operated electric kettle with a metal casing in one hand. The insulation of the live wire inside the kettle has worn away, causing it to touch the metal casing. With his other hand, he holds onto a grounded metal water pipe. What danger does this present to the electrician?
A current could pass through the electrician to the grounded pipe, causing a serious electric shock.
A current in the metal pipe could heat it up and burn his hand.
The large current would blow the fuse and instantly protect the electrician from any shock.
The ground connection would prevent any current from flowing through the kettle's casing.
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.