PETER MENZEL / SCIENCE PHOTO LIBRARY PETER MENZEL / SCIENCE PHOTO LIBRARY
Tesla coil. Members of the Tesla Coil Builders Association seen with their largest coil, nicknamed 'Nemesis'. A Tesla coil is essentially a large air-core transformer with a capacitor, named after its inventor, physicist Nikola Tesla (1856-1943). The coil is designed to give a high- voltage, high- frequency spark. Photographed in Richmond, Virginia, USA.
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