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Considerations for incandescent Lamps
Dec 28, 2017

The filament inside the incandescent bulb is made of very fine tungsten wire. When the lamp is working normally, the temperature reaches more than 2000 ℃, although it can not reach the melting point of the tungsten wire 3,370 ℃, but this kind of high temperature may evaporate a part of the surface of the tungsten filament. Therefore, after a long bulb, the glass bubble will slowly become black, the filament will slowly become thinner, the thickness is not so uniform. Because of the resistance of the conductor and its cross-sectional area, the thin local unit length of the resistance than the thick local unit length resistance, by the known, thin local heating power than the coarse place, therefore, the finer the place the higher the temperature. Uneven heating, not only will make the filament deformation, but also make the spiral of the filament turns uneven spacing, resulting in more uneven heat, turn the more dense place, the higher the temperature. For most conductors, resistance is associated with temperature, and the higher the temperature, the greater the resistance.

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