electric lamp di à ndēng [electric lamp;electric light] light using electricity as light energy
(electric lamp), the exact technical name istungsten lamp(incandescent light bulb). manuallight sourceone of them.
it is a current handlefilamentheating to incandescent state is used to alight.electric bulbthe shell is made of glass, keeping the filament in vacuum or low pressureinert gasnext, the function is to prevent the filament from being oxidized at high temperature. only 7% ~ 8% of its electric energy turns into visible light, more than 90% of its electric energy turns into heat, and tungsten lamp of its luminous efficiency is very low. however, it is the pioneer in the electric light world. modern tungsten lamp generally have a life span of about 1000 hours. the electric lamp is made according to the principle that electricity generates heat. today's bulbs are generally usedtungsten wiremake filament.
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