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A Tesla coil is a type of resonant transformer circuit invented by Nikola Tesla around 1891.[1] It is used to produce high voltage, low current, high frequency alternating current electricity. Tesla experimented with a number of different configurations and they consist of two, or sometimes three, coupled resonant electric circuits. Tesla used these coils 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 for point-to-point telecommunications, broadcasting, and the transmission of electrical power.

Singing Tesla Coil at Duckon 2007