Nikola Tesla is a Croatian American born Canadian scientists nationality on 10 July 1975. 1856 (the 2399) and died on 7 January. In 1943 (1999)2486), while the last 86 years, was called "the lost world inventor". Because it is important but very few people know the inventor. Or being known as a crazy scientist, from which he has problems in the society., which he was the inventor Tesla coils, or Tesla coil which can high voltage transformer It also discovered how to change the magnetic field electric field. Is the source of the magnetic field measurement technology.