In his pursuit to wirelessly transmit power, inventor Nikola Tesla designed the Tesla coil, an electrical resonant transformer circuit, in 1891. It produces high-voltage, low-current, high-frequency ac electricity. He experimented with different configurations consisting of two, or sometimes three, coupled resonant electrical circuits. Tesla patented the Tesla coil circuit April 25, 1891. Although he patented many similar circuits during this period, this was the first that contained all the elements of the Tesla coil: a high voltage primary transformer, a capacitor, a spark gap, and an air core oscillation transformer.
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