The thin wire in an electric bulb that gives out light is called a filament. Filament used in an electric bulb is made up of tungsten metal. When current is passed through the bulb, the filament gets heated up and produces light.

A switch is an electric device that is used to break or complete the circuit. When the switch is in 'ON' position, current flows through the circuit and when it is in 'OFF' position, current does not through the circuit.

A device which converts chemical energy into electrical energy is called a dry cell. A carbon rod with metal cap acts as positive terminals and a zinc metal plate acts as a negative terminal.