Question

Explain the provision of an earthing wire.Answer the given question in brief.

Answer 1

Basically earthing wire is the safety measure to prevent shocks and device damage. The following points will clarify:

Devices like electric motor, heater, iron and refrigerator use very high amount of current.
So sometimes, there is a leak of electricity/current from these devices, the leaked current reaches the metallic plates present under these devices and if we touch such devices with bare hand we will get a shock. This may cause very harmful damage.

$\:\:\:$ So, to prevent such type of situation there is earthing wire, which basically absorb all the leaked current from the device and dump it to the earth. As, earthing wire is connected between metallic plates of device and earth. Earth then absorb all the leaked current and prevent us from any danger.
This dumping of leaked current from the device is very useful as it prevents damage to the device as well as human.