The alternating current output is in the low radio frequency range, usually between 50 kHz and 1 MHz. Tesla coils can produce output voltages from 50 kilovolts to several million volts for large coils.
More sophisticated designs use transistor or thyristor switches or vacuum tube electronic oscillators to drive the resonant transformer. Tesla's original circuits as well as most modern coils use a simple spark gap to excite oscillations in the tuned transformer. Tesla coils are used for entertainment at science museums and public events, and for special effects in movies and televisionĪ Tesla coil is a radio frequency oscillator that drives an air-core double-tuned resonant transformer to produce high voltages at low currents. The high electric field causes the air around the high voltage terminal to ionize and conduct electricity, allowing electricity to leak into the air in colorful corona discharges, brush discharges and streamer arcs. Homemade Tesla coil in operation, showing brush discharges from the toroid. With solid-state drivers, a Tesla coil can be used to generate audible tones, to produce musical effects. Originally, Tesla coils used fixed spark gaps or rotary spark gaps to provide intermittent excitation of the resonant circuit more recently electronic devices are used to provide the switching action required. Today, their main usage is for entertainment and educational displays, although small coils are still used as leak detectors for high vacuum systems. Tesla coil circuits were used commercially in sparkgap radio transmitters for wireless telegraphy until the 1920s, and in medical equipment such as electrotherapy and violet ray devices. Tesla used these circuits to conduct innovative experiments in electrical lighting, phosphorescence, X-ray generation, high frequency alternating current phenomena, electrotherapy, and the transmission of electrical energy without wires. Tesla experimented with a number of different configurations consisting of two, or sometimes three, coupled resonant electric circuits. It is used to produce high- voltage, low- current, high frequency alternating-current electricity. Transformer, electromagnetic field, resonanceĪ Tesla coil is an electrical resonant transformer circuit designed by inventor Nikola Tesla in 1891. Tesla coil at Questacon, the National Science and Technology center in Canberra, AustraliaĪpplication in educational demonstrations, novelty lighting, music
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