The Latin word incandescens, derived from incandescĕre (which can be translated as "Become hot" ), came to our language as incandescent . This term is used to qualify what, as a result of hot , he redden or whitens .
A Incandescent lamp , in this framework, it is an element that, through the heating of a metal filament, generates light . These lamps, also known as incandescent light bulbs , take advantage of the call Joule effect to heat a piece of tungsten thanks to the electric current and turn it to white red: that is, a whitish hue due to the high temperature.
Incandescent lamps were invented at the end of XIX century . They have a glass bulb or bulb, which is made empty or filled with an inert gas. Inside, the heated tungsten filament, contact wires, a wire to dissipate heat and a cooling duct. The light bulb It also has an electric contact foot and an insulation.
For a long time, incandescent lamps were among the most used devices for lighting. However, technological development contributed to discover more efficient methods, since these lamps barely turn the light into 15% of the electricity they consume: the rest, they transform it into hot .
It should be noted that it is called glow to the emission of light that is produced by heat. Incandescent bodies, in this way, are heated until they emit electromagnetic radiation in the visible spectrum. A volcano, for example, ejects incandescent materials during a eruption , in addition to smoke.