How do Incandescent Lights work

Help I need to do this for homework.

Thanks in advanc.

The incandescent light makes light by heating a metal filament wire to a high temperature until it glows. The hot filament is protected from air by a glass bulb that is filled with inert gas or evacuated. In a halogen lamp, a chemical process that returns metal to the filament prevents its evaporation. The light bulb is supplied with electrical current by feed-through terminals or wires embedded in the glass. Most bulbs are used in a socket (a housing giving mechanical support to the bulb, keeping its terminals in contact with the supply current terminals).

The filament used for this type of light have very high melting point like tungsten (tungsten has the highest melting point (3422 °C, 6192 °F)).