History Of Thomas Edison?

describe edison's first light globe and the improvements he made up to 1880


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  • 8 years ago
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    Edison did not invent the first electric light bulb, but instead invented the first commercially practical incandescent light.

    It Is clear that Tomas Alva Edison could not be credited with the invention of the electric light bulb (incandescent lamp). Nevertheless, his contribution to the perfection of this device is really impressing.

    In 1878, Edison applied the term filament to the element of glowing wire carrying the current, although the English inventor Joseph Swan had used the term prior to this.

    Until 1878 when Edison decided to throw the bulk of his attention and resources into the perfection of the light bulb the best source of lighting was gas. Unfortunately it was far from convenient. It was dirty, unhealthy, uncomfortable and dangerous. When gas burned it created soot everywhere. It degraded the air quality by emitting soot and depleting oxygen. During the summer it made the air even hotter and more uncomfortable. It caused explosions, fires and its care could not be trusted to children. But the major deficit of gas was that it could not serve as a source of power. The appliances we take for granted today - fans, refrigerators, electric irons and computers - could not be powered by gas, at least not in a convenient way.

    By 1879, Edison had produced a new concept: a high resistance lamp in a very high vacuum, which would burn for hundreds of hours. While the earlier inventors had produced electric lighting in laboratory conditions, dating back to a demonstration of a glowing wire by Alessandro Volta in 1800, Edison concentrated on commercial application, and was able to sell the concept to homes and businesses by mass-producing relatively long-lasting light bulbs and creating a complete system for the generation and distribution of electricity.

    On the other hand, light bulbs existing prior to Edison’s efforts burned for a short time – the best achievement was Swan’s, 13.5 hours, though a great breakthrough, not commercially yet. In 1879 Edison obtained an improved Sprengel vacuum pump, and it proved to be the catalyst for a breakthrough. Edison discovered that a carbon filament in an oxygen-free bulb glowed for 40 hours. Soon, by changing the shape of the filament to a horseshoe it burned for over 100 hours and later, by additional improvements, it lasted for 1500 hours.

    Edison's method for generating and transmitting electricity employed direct current (DC) whereas modern power stations employ alternating current (AC ) introduced by George Westinghouse based on Nikola Tesla, and others’, patents.

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