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How does an incandescent lamp work

Update:22 Feb 2020
Summary:

The filament temperature of a lit incandescent lamp is […]

The filament temperature of a lit incandescent lamp is as high as 3000 ° C. It is precisely because the hot filament produces light radiation that makes electric lamps emit bright light.

At high temperatures, some tungsten atoms will evaporate into gas and be deposited on the glass surface of the bulb, making the bulb black. Therefore, incandescent lamps have been created with a "belly-feeling" appearance. This is to make the deposited tungsten atoms Diffuse on a larger surface.Tungsten combines with oxidation in the air to form a thin layer of a mixture of blue tungsten dioxide and tungsten oxide. The reason is that the oxygen in the air oxidizes the high-temperature tungsten wire. Therefore, the tungsten filament bulb must be evacuated to remove all the air.

When the current passes through the filament, heat is generated. The spiral filament continuously gathers heat, making the filament temperature reach an incandescent state above 2000 degrees Celsius (the filament generally uses tungsten filament, and the melting point is about 3000 degrees Celsius). At this time, the electrons outside the nucleus that make up the filament element Will be excited, so that it will transition to a higher energy outer layer. When the electrons transition to a lower energy electron layer again, the excess energy will be released in the form of light and generate heat at the same time, so it is called an incandescent lamp