A teacher asks, 'How do the earth wire and the fuse work together to protect a user if a fault causes the live wire to touch the metal casing of an appliance?'
Student 1 says, 'The earth wire provides a path of very low resistance to the ground, which allows a very high current to flow.'
Student 2 says, 'This high current exceeds the rating of the fuse, causing the fuse to melt and break the circuit.'
Who is correct?
both students
neither student
Student 1 only
Student 2 only
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.