A teacher asks, 'What is the purpose of the earth wire in an electrical appliance with a metal case?'
Student 1 says, 'It reduces the current passing through the live wire to make the appliance more energy efficient.'
Student 2 says, 'It provides a low-resistance path to earth so that if the live wire touches the metal case, a large current flows and blows the fuse.'
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.