Tesla moved to the United States in 1884. When he arrived, he worked as an assistant to Thomas Edison, then in his late 30's. Edison had just invented the electric light bulb, but he needed a system to distribute electricity to houses. He designed a DC (direct current) system, but it had many bugs in it. Edison promised Tesla lots of money in bonuses if he could get the bugs out. Tesla took the challenge and ended up saving Edison over $100,000, which was millions of dollars by today's standards. Edison later refused to keep his promise. Tesla quit not long after that, and Edison spent the rest of his life trying to discredit Tesla which is the main reason why he is so unknown today. Edison was envious of him and instead of working a relatioship and working with him, the rest is known.
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Thomas Edison did not invent electricity. He invented means of making use of electricity.
Thomas Edison invented the first successful electric light bulb. He and his staff at his workshop in Menlo Park New Jersey.
Though people claim Edison invented the light bulb, it was previously discovered by many inventors which includes Nikola Tesla. But Edison found a way where everyone could use it and hence Edison has been credited for the invention of the light bulb.
I am guessing you are trying to say when did Thomas Edison invent the light bulb. He invented the light bulb on October 22nd, 1879.
Thomas Edison invented stuff .EX:first light bulb