Approximately 95% of the electricity applied to the filament in an incandescent bulb is then lost as heat rather than light. Frosted light bulbs are a result of the powder coating on the inside of the glass enclosure.Īlthough incandescents are simple to manufacture and therefore inexpensive to purchase, an incredible amount of heat must be produced to make a decent amount of light. Tungsten filaments are a common filament in many traditional light sources because pure tungsten has the highest melting point, lowest vapor pressure, and greatest tensile strength of all metals. Inert gases, also known as noble gases, don’t often react to other chemicals and conditions, allowing them to preserve and protect the filament from evaporating when heated. Sometime the enclosure (aka the envelope) is actually filled with an inert gas like nitrogen or argon.
The familiarly-shaped glass enclosure is a vacuum free of oxygen which disintegrates the filament.
Incandescent light bulbs are the result of an electric current passing through a tungsten filament and heating it to a temperature hot enough to produce light a secondary output.
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