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| [00:05.20]Nikola Tesla developed the alternating current power system that provides electricity in the United States. [00:14.42]Many of his other discoveries led to electronic inventions for which other scientists were honored. [00:22.75]Mister Tesla held more than 100 patents given by the United States government. [00:28.97]A patent gives the inventor the right to make, use and sell his invention for a period of time [00:39.18]Nikola Tesla was born in what is now Croatia in 1856. [00:45.19]He began inventing when he was a child. [00:48.67]He later studied to be an electrical engineer. [00:52.66]He moved to the United States in 1884, He became an American citizen five years later. [01:01.07]Nikola Tesla received a patent for his alternating electric power system in 1888, [01:09.69]He was working in his own laboratory in New York City. [01:14.03]George Westinghouse bought the patent rights from Mr Tesla. [01:19.60]Then Mister Westinghouse launched the campaign [01:23.38]that established alternating current as the electric power system in the United States. [01:30.64]What is alternating current? [01:33.62]The electricity used in a light bulb, for example, comes from a power center that may be kilometers away. [01:42.45]The strength of the electric power would become weak if it traveled a long distance at the same level. [01:50.24]Alternating the strength of the current keeps it strong. [01:55.02]The current changes from negative to positive sixty times each second. [02:01.16]Mister Tesla also invented a device known as the Tesla Coil. [02:07.79]It is the basis for radio, television and other means of wireless communication. [02:14.87]He also invented a kind of light bulb and the X-ray machine. [02:20.70]Mister Tesla created a general design for radio, [02:26.34]but was not recognized for it during his life. [02:29.84]He did the work in 1892. [02:33.57]Guglielmo Marconi later claimed the patent rights. [02:37.54]Mister Tesla made an unsuccessful attempt to oppose Mister Marconi's claims in 1915. [02:45.88]It was not until 1943 that the United States Supreme Court ruled that Mister Tesla was the legal inventor of radio. [02:56.33]Nikola Tesla had died a few months earlier. [03:00.51]He and his work had been forgotten by the public. [03:04.69]Experts say he was not recognized because of several reasons. [03:10.15]He failed to market his inventions. [03:13.62]He made enemies of powerful men. [03:16.99]Many of his later ideas were considered to be very strange,But experts say the world has changed since then, |
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