Tungsten Filament in Tungsten Light Bulb

Tungsten Filament Picture

Tungsten light bulb uses tungsten filament in incandescent light bulbs. A filament is a thin metal wire that glows when electricity is passed.In a tungsten light bulb the light is generated by heating a filament with electricity until it becomes white hot and glows.Tungsten filaments are used due to its high melting point. Because of this high melting point tungsten filaments are very opt to be used in the electric bulbs.

The tungsten is the main part in the tungsten light bulb.The filament made of tungsten is extremely thin and long. For a standard bulb of 60 watt the filament is six feet long and very thin. The diameter is about one-hundredth of an inch. The two ends of the tungsten filament are connected to the positive and negative end of the power source. When electric current passed the filament rises to a temperature between 2,200 and 2,500 degrees Centigrade. Longer filaments produce more light and needs higher voltage. Low voltage bulbs have shorter coils and produce less light.

The positive and negative ends of the power supply are connected to the two ends of the filament.This is done via the metal casing at the bottom and a black covering at the extreme tip of the bulb.The black metal tip is connected to the positive and the negative to the metal casing. This is in such a way that it fits in the bulb holder.