The incandescent light bulb is a source of electric light that works on the principle that when a body is heated; radiant energy is emitted in waveform. An electric current passes through a thin filament, heating it to a temperature that produces light. The enclosing glass bulb contains either a vacuum or an inert gas to prevent oxidation of the hot filament.
The Average efficiency of tungsten filament lamp is about 10 lumens per watt. A metal filament can work in vacuum bulb up to 2000 C without oxidation and if it is worked beyond this temperature it vaporizes quickly and blackens the lamp.
Incandescent lamps are nearly pure resistive loads with a power factor of 1. This means the actual power consumed (in watts) and the apparent power (in volt-amperes) are equal.
The Average efficiency of tungsten filament lamp is about 10 lumens per watt. A metal filament can work in vacuum bulb up to 2000 C without oxidation and if it is worked beyond this temperature it vaporizes quickly and blackens the lamp.
Incandescent lamps are nearly pure resistive loads with a power factor of 1. This means the actual power consumed (in watts) and the apparent power (in volt-amperes) are equal.
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Incandescent Light Bulb