Nikola Tesla (10 July 1856 – 7 January 1943; Serbian: Никола Тесла) was a Serbian-American inventor, electrical engineer, mechanical engineer and physicist. He is best known for his contributions to the design of the modern alternating current (AC) electricity supply system. He was born in Smiljan, in the part of former Austria-Hungary that is now Croatia. He later became an American citizen.

Tesla got his first job in Budapest in 1882, working at a telephone company. A few years later he moved to the United States. Even in his early life, he was inventing things. His best known invention was an electric motor that could run well on AC power. Tesla died of coronary thrombosis in a hotel room in Manhattan, New York City on 7 January 1943.


Tesla was born on 10 July 1856 in Smiljan, Austrian Empire (modern-day Croatia). Tesla's father, Milutin Tesla, was a priest in the Serbian Orthodox Church. His mother was a housewife who was of Serbian descent. She was born in the Stari Vlah (Raska) region of Serbia. He was the fourth child out of five. He had one older brother, Dane, two older sisters, Angelina and Milka, and one younger sister, Marica.



Tesla had a job in telephony and electrical engineering before moving to the United States in 1884 to work for Thomas Edison. They quarreled and soon Tesla started working on his own with other people investing in his work. He set up laboratories and companies to develop a range of electrical devices. His patented AC electric motor (induction motor) and transformer were licensed by American industrialist George Westinghouse.

Westinghouse also hired Tesla for one year to help develop a power system using alternating current. The advantage that popularized alternating current is the use of transformers for long distance electric power transmission. Tesla is also known for his high-voltage, high-frequency power experiments in New York and Colorado Springs, Colorado which included inventions and ideas used in the invention of radio communication, for his X-ray experiments, and for his unsuccessful attempt at worldwide wireless transmission in his unfinished Wardenclyffe Tower project.

Tesla's achievements made him very famous. So did his abilities as a showman, demonstrating his seemingly miraculous inventions. Although he made a great deal of money from his patents, he spent a lot on his experiments. He lived for most of his life in a series of hotels in New York City. The end of his patent income and eventual bankruptcy led him to live in much poorer circumstances. Tesla still continued to invite the press to parties he held on his birthday to announce new inventions he was working and make (sometimes unusual) statements. Because of his wonderful pronouncements without results or proof, Tesla gained a reputation in popular culture as the archetypal "mad scientist". He died in room 3327 of the New Yorker Hotel on 7 January 1943.

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Tesla's work fell into relative obscurity after his death, but since the 1990's, his reputation has experienced a comeback in popular culture. His work and reputed inventions are also at the center of many conspiracy theories and have also been used to support various pseudosciences, UFO theories and New Age occultism. In 1960, in honor of Tesla, the General Conference on Weights and Measures for the International System of Units dedicated the term "tesla" to the SI unit measure for magnetic field strength.