Tesla coil circuits were used commercially in spark-gap radio transmitters for wireless telegraphy until the 1920s, ...
.... and in medical equipment such as electrotherapy and violet ray devices.
A Tesla coil is a RADIO frequency oscillator that drives an air-core double-tuned resonant transformer to produce high voltages at low currents.
The alternating current output is in the low radio frequency range, usually between 50 kHz and 1 MHz.
Although some oscillator-driven coils generate a continuous alternating current, most Tesla coils have a pulsed output;...
... the high voltage consists of a rapid string of pulses of RADIO frequency alternating current.
The current flows rapidly back and forth between the plates of the capacitor through the coil, generating RADIO frequency oscillating current in the primary circuit at the circuit's resonant frequency.
The resonant frequency of Tesla coils is in the low radio frequency (RF) range, usually between 50 kHz and 1 MHz.
However, because of the impulsive nature of the spark they produce BROADBAND RADIO NOISE, and without shielding can be a significant source of RFI, interfering with nearby radio and television reception.
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