Electric Power and Its Uses

What contribution did Thomas Edison make to the electric light?

The American inventor Thomas Alva Edison (1847-1931) tried literally hundreds of different materials as filaments for the lamp. He found that heating a cotton thread in the air left a thin length of almost pure carbon. The carbon filament was connected to wires sealed in a glass bulb from which the air was removed. In 1878 this first practical electric lamp lasted for hours more than any other lamp.


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