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A Tesla coil is an electrical resonant transformer circuit designed by inventor Nikola Tesla in 1891. [1] It is used to produce high-voltage, low-current, high-frequency alternating-current electricity. [2] [3] Tesla experimented with a number of different configurations consisting of two, or sometimes three, coupled resonant electric circuits.
With the success of Tesla's A.C. system, it soon became the preferred method of generating electricity worldwide. Tesla worked on a number of other inventions, including a transformer that would change a low voltage to a high voltage by means of safe A.C. electric current. This transformer came to be known as the Tesla coil.
The photo was part of a publicity spread taken by photographer Dickinson Alley in December 1899 to accompany Tesla's magazine article Nikola Tesla, "The Problem of Increasing Human Energy", Century Magazine, The Century Co., New York, June 1900, fig. 8; a version without Tesla appears in the article. Wellcome Images
These long arcs were not a feature of the normal operation of the coil because they wasted energy; for these photos Tesla forced the machine to produce arcs by switching the power rapidly on and off. The photo was part of a publicity spread taken by photographer Dickinson Alley in December 1899 to accompany his magazine article Nikola Tesla ...
It is interesting to note that rigorous mathematical descriptions of Tesla's Magnifier did not become available until 50-100 years after Tesla's pioneering work. Modern analyses have succeeded in applying distributed "transmission line" descriptions of the "extra coil" rather than the usual lumped-constant analysis.
English: Circuit diagram of a modern unipolar W:Tesla coil, a spark-excited resonant transformer circuit which produces high frequency high voltage alternating current at low current levels. It was invented by Serbian-American inventor Nikola Tesla in 1891.
In the majority of Tesla's experiments, he used machinery of his own design to produce the Tesla effect. These early coils would use the "disruptive" action of a spark gap in their operation. The setup can be duplicated by a Ruhmkorff coil, two condensers (now called capacitors), and a second, specially constructed, disruptive coil.
This is a modern unipolar version of the circuit used for entertainment coils, in which one side of the secondary is grounded and the other side is connected to a toroidal-shaped capacitive high voltage terminal. A slightly different form of the circuit, with the positions of the capacitor and spark gap exchanged, is found at Tesla coil 3.svg