physics

A cell is an arrangement in which chemical energy is converted into electrical energy.

The S.I. unit of charge is Columb.

It is a device used to protect a building from damage by lighting during a thunderstorm.

A gold leaf electroscope is a instrument used for detecting the presence and the sign of electric charge on a body.

Conduction just means that the two objects will come into actual physical contact with each other.

Miniature circuit breakers

The connecting of a device to the earth.

An electric fuse is a short length of easily fusible wire put into an electrical circuit for protection purposes.

The third wire, called the earth wire is a safety wire.

The neutral wire completes the circuit and carries current away from the appliance.