An electrician measures a current of 0.0 A in the earth wire of an appliance and a current of 4.5 A in its live wire. What does this show?
The appliance has a fault in its live wire
The appliance has a fault in its earth wire
The appliance is working with no fault present
The appliance is switched off at its own switch
40 exam-style questions on AQA GCSE Physics 2.3 Domestic uses and safety, covering 2.3.1 Direct and alternating potential difference and 2.3.2 Mains electricity. Each one has a worked solution and a mark scheme showing where the marks go.