A tungsten light bulb refers generally to incandescent light bulbs, which are lights that generate light by heating a metal wire or filament with electricity until it becomes white hot and glows.
Definition
Tungsten light bulbs are named for the metal tungsten, a gray material that has an extremely high melting point. Because of its high melting point and its strength, it makes for a good filament in light bulbs. A filament is a metal wire that glows when electricity is channeled into it. Light bulbs that use this method to generate light with heat are called incandescent lights.
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Tungsten
History
The history of tungsten light bulbs dates back more than 100 years. Modern tungsten light bulbs were developed by General Electric around 1906. Before that, inventors experimented with many other kinds of light bulbs with alternative filaments. However, other materials had lower melting points and did not last as long as tungsten bulbs.
Burning Out
Over time, tungsten filaments can wear out. The repeated heating of the metal causes it to slowly evaporate. The wire slowly gets thinner and more fragile until it breaks, either spontaneously or by jostling. If you drop a bulb and the glass doesn't break, shake it. If you hear a rattling sound, that means the tungsten filament wire has snapped and the two ends are slapping against each other.
Energy Inefficiency
Tungsten and other incandescent bulbs have fallen out of favor in many households because they tend to be inefficient. Much of the electricity that is channeled into the thin wire of tungsten is radiated as heat rather than light. Other light bulbs such as fluorescent lamps, high-intensity discharge lamps and light-emitting diodes (LEDs) are becoming more popular because they are more efficient.
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