physics electricity test

what is the voltage and frequency of the main electricity?

230V and 50Hz

Explain electrocution 

the live wire is at 230V even when the main is switched off. There is a high potential difference between you and the wire. If you touch the wire you are providing a path for current to flow from the live wire to the earth and to you resulting in an electric shock

What will happen if the live wire touches the casing of an appliance?

the appliance is at 230V and if you touch the casing, you will receive a shock - electrocution

Explain the consequences of a fuse if the live wire touches the metal casing

the earth wire has low resistance so, a large current flows from the…