The operating current of an electric heater is 8 A and it is normally protected by a 10 A fuse. The owner of the heater mistakenly replaces the 10 A fuse with a 5 A fuse. What happens when the heater is switched on?
The fuse melts and the heater might be damaged.
The fuse melts and the heater is undamaged.
The fuse does not melt and the heater works correctly.
The fuse does not melt but the heater fails to work.
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.