A transformer without iron, for high frequency alternating or oscillating currents; an oscillation transformer.

a step-up transformer with an air core; used to produce high voltages at high frequencies

a device that uses resonance to boost an electrical signal to many times its original amplitude

a disruptive discharge coil

a high frequency, very high voltage transformer

a high-voltage air-core resonant transformer generating very high voltages at high frequency

an air-core, dual-tuned resonant transformer that generates very high high-voltage s at radio frequencies

an air core transformer that operates on very high frequency AC

a radio frequency, quarter-wavelength antenna

a radio frequency transformer

a resonant, air-core, step-up transformer designed to produce very high AC voltages at high frequency

a special kind of transformer

a special transformer that takes a small amount of power and boosts it rapidly to a great deal of power

a step-up transformer which has an air core to produce high voltages at high frequencies

a transformer for high-frequency current, used in therapeutic treatment

a transformer made up of two parts - a primary and secondary coil, one inside the other

A Tesla coil is a category of disruptive discharge transformer coils, named after their inventor, Nikola Tesla. Tesla coils are composed of coupled resonant electric circuits. Nikola Tesla actually experimented with a large variety of coils and configurations, so it is difficult to describe a specific mode of construction that will meet the wants of those who ask about "Tesla" coils.