Uses of electroplating:
(i) Zinc is deposited over Iron by electroplating to protect it from corrosion and rust formation. It is used in automobile industries.
(ii) Wheel rims, car parts, bath taps etc. requires a non-corrosive, non-scratchy, shiny metal. Chromium suits well but it is expensive. So they are made from a cheaper metal and a coating of chromium is deposited over it by electroplating.

The process of depositing a layer of one metal over the surface of another metal by passing electric current is called electroplating.

The path through which electrons flow from one terminal to another terminal of the source is called electric circuit.

Earthing is the process of connecting the exposed metal parts of an electric circuit to the ground with the help of low resistance wire. It is a safety measure devised to prevent people from getting shocked if the insulation inside electrical devices fails.

When two materials are rubbed together, some electrons are transferred from one material to the other, leaving them both with a net electric charge.
E.g. When a glass rod is rubbed with a silk cloth the free electrons in the glass rod are transferred to silk cloth. Thus, the glass rod acquires a positive charge and the silk cloth acquires a negative charges.