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Tesla coil

noun, Electricity.
an air-core transformer used to produce high voltages of high-frequency alternating currents.
Also called Tesla transformer.
Origin of Tesla coil
First recorded in 1900-05; named after its inventor, N. Tesla Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for Tesla coil

tesla coil

a step-up transformer with an air core, used for producing high voltages at high frequencies. The secondary circuit is tuned to resonate with the primary winding
Word Origin
C20: named after Nikola Tesla
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Tesla coil in Science
tesla coil  
An electrical device that generates extremely high voltages, usually for the purpose of creating dramatic electric arcs and lightning effects or for producing x-rays. Tesla coils use step-up transformers to boost the voltage of a power supply and build up large charges in a capacitor. A spark gap periodically shorts out the capacitor, releasing its charge in huge current flows, that generate extremely high voltages (up to ten million volts) through an open-air transformer.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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