Why do light bulbs must use tungsten wire?
At such high temperatures other substances can not maintain their own performance temperature, but the tungsten wire melting point of more than 5000 degrees, fully able to withstand such a temperature.
The tungsten wire heated to thousands of degrees of high temperature, and then in such a high temperature, tungsten light.
Because the melting point of tungsten high ah. The essence of incandescent lamp is through the energy into heat,
