An electric blender has an outer casing made entirely of plastic. The manufacturer has fitted it with a two-core cable containing only a live wire and a neutral wire, but no earth wire.
Why does this kitchen appliance not require an earth connection?
Plastic is an electrical insulator, so the outer casing cannot become live and cause an electric shock.
The blender is designed to only operate when the user presses the start button.
The internal motor uses alternating current, which prevents a continuous current pathway to the user.
The fuse in the plug provides full protection against electric shock under any fault conditions.
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.