An appliance is designed with double insulation. Which statement correctly explains why this appliance is safe to use without an earth wire?
The insulating outer casing prevents any path for electric current to the user even if an internal live wire becomes loose.
The fuse melts much quicker than normal, cutting off the current before a shock can occur.
The live and neutral wires are swapped, so the outer casing always remains neutral.
The appliance operates on a very low voltage which cannot cause a harmful electric shock.
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.