<Tr> <Th> Related items </Th> <Td> Transformer, electromagnetic field, resonance </Td> </Tr> <P> A Tesla coil is an electrical resonant transformer circuit designed by inventor Nikola Tesla in 1891 . It is used to produce high - voltage, low - current, high frequency alternating - current electricity . Tesla experimented with a number of different configurations consisting of two, or sometimes three, coupled resonant electric circuits . </P> <P> Tesla used these circuits to conduct innovative experiments in electrical lighting, phosphorescence, X-ray generation, high frequency alternating current phenomena, electrotherapy, and the transmission of electrical energy without wires . Tesla coil circuits were used commercially in sparkgap radio transmitters for wireless telegraphy until the 1920s, and in medical equipment such as electrotherapy and violet ray devices . Today their main use is for entertainment and educational displays, although small coils are still used today as leak detectors for high vacuum systems . </P> <P> A Tesla coil is a radio frequency oscillator that drives an air - core double - tuned resonant transformer to produce high voltages at low currents . Tesla's original circuits as well as most modern coils use a simple spark gap to excite oscillations in the tuned transformer . More sophisticated designs use transistor or thyristor switches or vacuum tube electronic oscillators to drive the resonant transformer . </P>

What can you do with a tesla coil
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