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(1) Incandescent lamp is also called electric bulb. Its […]
(1) Incandescent lamp is also called electric bulb. Its working principle is that heat is generated when the current passes through the filament (tungsten wire, melting point is more than 3000 degrees Celsius). The spiral filament continuously collects heat, so that the temperature of the filament reaches 2000 degrees Celsius or above. When it is in an incandescent state, it glows like a red iron that glows. The higher the temperature of the filament, the brighter the light emitted. Therefore, it is called an incandescent lamp. When an incandescent lamp illuminates, a large amount of electrical energy is converted into heat, and only a very small portion can be converted into useful light energy.
(2) The light emitted by incandescent lamps is full-color light, but the composition ratio of various color lights is determined by the luminescent material (tungsten) and temperature. The imbalance of the proportion leads to the color cast of the light, so the color of the object under the incandescent lamp is not real enough.
(3) The life of an incandescent lamp is related to the temperature of the filament, because the higher the temperature, the easier the filament will sublimate. The blackening process at both ends of the fluorescent lamp is: the sublimation of the tungsten wire directly turns into tungsten gas. These tungsten gases encounter the lower temperature of the lamp wall and condense on the wall of the lamp tube and become black. When the tungsten wire sublimes to a relatively thin When it is thin, it is easy to blow off after power-on, thus ending the life of the lamp. So the power of incandescent lamps is greater.