An electric heater is connected to a mains supply by insulated cables. The circuit is protected by a fuse, but the connecting cables become dangerously hot during use. Which modification would prevent the cables from heating up as much?
Install a second fuse in the neutral wire.
Replace the cables with ones that have a larger cross-sectional area.
Use a fuse with a higher current rating.
Use cables with thicker plastic insulation.
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.