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Why can electric lamp give off light?
From;    Author:Stand originally

You observe bulb carefully, there can be a very fine sinuate line in order to show in bulb, it is called tungsten filament. Namely because had it, bulb just can shine. After mains switch is opened, electric current entered tungsten filament through electrical wiring. Tungsten filament should hold back voltaic advancement, in this process, produced much heat, make tungsten filament gives out white-hot light, it is lamplight. The first bulb was 1879 invent by edison.

Little knowledge

Most what invent electric light first is British scientist Si Wang, he invented electric light of the first carbon filament 1860.



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