what is the purpose of a tesla coil
Tesla coil The Tesla coil is an electrical resonant transformer circuit designed by inventor Nikola Tesla in 1891.[1][2] It is used to produce high-voltage, low-current, high frequency alternating-current electricity.[3][4][5][6][7][8][9] Tesla experimented with a number of different configurations consisting of two, or sometimes three, coupled resonant electric circuits.
Electromagnet Danish scientist Hans Christian Ørsted discovered in 1820 that electric currents create magnetic fields. British scientist William Sturgeon invented the electromagnet in 1824.[3][4] His first electromagnet was a horseshoe-shaped piece of iron that was wrapped with about 18 turns of bare copper wire (insulated wire didn't exist yet). The iron was varnished to insulate it from the windings. When a current was passed through the coil, the iron became magnetized and attracted other pieces of iron; when the current was stopped, it lost magnetization. Sturgeon displayed its power by showing that although it only weighed seven ounces (roughly 200 grams), it could lift nine pounds (roughly 4 kilos) when the current of a single-cell battery was applied. However, Sturgeon's magnets were weak because the uninsulated wire he used could only be wrapped in a single spaced out layer around the core, limiting the number of turns.