The resistivity of tungsten wire is 5.3*10^-8. The melting point of tungsten is high, the resistivity is high, the strength is good, and the vapor pressure is low. It is the best material for making incandescent filaments in all pure metals. However, tungsten is hard and brittle and difficult to process. When the current is heated to a certain temperature through the tungsten wire, the resistance value of the tungsten wire is increased to a certain value (generally, the resistance value of the wire increases as the temperature increases). The resistance of the material should be 1370 ° C - 2000 ° C at normal temperature, but the resistance value changes when the cross sectional area length of the tungsten wire changes. In 1909, Kulic invented the processing technology of tungsten wire, which played a decisive role in the production and promotion of incandescent bulbs. The basic principle has been used today.
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