Electric Bulb
Incandescent light bulb The filament is enclosed in a glass bulb with a vacuum or inert gas to protect the filament from oxidation. They require no external electrical equipment , have low manufacturing costs, and work equally well on either alternating current direct current. As a result, the incandescent bulb became widely used in household and commercial lighting, for portable lighting such as table lamps, car headlamps flashlights, and for decorative and advertising lighting. Heat lamps are made for uses such as incubators lava lamps, and the Easy-Bake Oven toy. A common type of incandescent lightbulb consists of a long thin cylindrical envelope containing a small amount of mercury vapor at its inner end and filled with argon or krypton gas at the outer end. When electricity passes through this device, electrons collide with atoms of the metal inside the bulb causing them to emit ultraviolet radiation which then causes the mercury atoms to glow red hot. This process produces enou
