An electric lawnmower with a metal outer chassis is connected to the UK mains supply. During use, a vibration causes the live wire inside the lawnmower to come loose and contact the metal chassis.
Explain how the earth wire protects the user from receiving a fatal electric shock in this scenario.
10 exam-style questions on Edexcel GCSE Physics 10.4 Mains electricity. Each one has a worked solution and a mark scheme showing where the marks go.