Friday, December 13, 2013

light:Why is the history of electric light fascinating?

Why is the history of electric light fascinating?
 For thousands of years, people all over the world have been fascinated by lightning.

 In 1752, a genius named Benjamin Franklin conducted an experiment to prove that lightning was caused by electricity. I hroughout the next hundred years, many Inventors and scientists tried to find a way to use electrical power to make light.

 In 1800, Humphry Davy, an English scientist, experimented with electricity, and invented an electric battery. When he connected wires to his battery and a piece of carbon, the carbon glowed, producing light. This is called an electric arc.

 Later, the English physicist Sir Joseph Wilson Swan demon-strated his new electric lamps in England. These
lamps used a carbon filament inside a glass bulb to produce incandescent light. However, it was the inventor Thomas Alva Edison's lamp that became the first commercially successful incandescent lamp. In 1910, William David Coolidge invented a tungsten filament which lasted even longer than the older filaments. This incandescent bulb revolutionized the world.

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