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An induction coil or "spark coil" (archaically known as a Ruhmkorff coil) is a type of disruptive discharge coil. It is a passive electrical device used to produce high-voltage pulses from a low-voltage DC supply. In language, an archaism is the deliberate use of an older form that has fallen out of current use. ...
A Disruptive discharge is the result of a dielectric being stressed beyond its dielectric strength. ...
Direct current (DC or continuous current) is the continuous flow of electricity through a conductor such as a wire from high to low potential. ...
Description
An induction coil is an early version of an electrical transformer. It consists of two coils of insulated copper wire wound around a common iron core. One coil, called the primary, is made using tens or hundreds of turns of coarse wire. The other coil, called the secondary, typically consists of many thousands of turns of fine wire. In operation, an electric current is passed through the primary, creating a magnetic field. Because of the common core, most of the primary's magnetic field also couples to the secondary winding. The primary behaves as an inductor, storing energy in the associated magnetic field. When the primary current is suddenly interrupted, the magnetic field rapidly collapses. This causes a high voltage pulse to be developed across the secondary terminals through electromagnetic induction. Because of the large number of turns in the secondary coil, the secondary voltage pulse is typically many thousands of volts. This voltage is often sufficient to cause an electrical discharge, or spark, to jump across an air gap separating the secondary's output terminals. For this reason, induction coils were sometimes called spark coils. Most induction coils utilized a magnetically activated vibrating switch (called the interrupter) to rapidly connect and break current flowing into the primary coil. A coil is a series of loops. ...
For other uses, see transformers. ...
Electric current is by definition the flow of electric charge. ...
An inductor is a passive electrical device employed in electrical circuits for its property of inductance. ...
In electrical engineering High voltage refers to a voltage which is high. ...
Electromagnetic induction is the production of an electrical potential difference (or voltage) across a conductor situated in a changing magnetic flux. ...
Josephson junction array chip developed by NIST as a standard volt. ...
An electrostatic discharge (ESD) is a sudden flow of electric current through a material that is normally an insulator. ...
Look up Spark in Wiktionary, the free dictionary. ...
Electrical switches. ...
The term "Induction coil" is also used for a coil carrying high-frequency AC and intended to induce eddy currents to heat objects placed in the interior of the coil, such as in induction heating or zone melting. City lights viewed in a motion blurred exposure. ...
A semiconductor induction heater with a small inductor Induction heating is the process of heating a metal object by electromagnetic induction, where eddy currents are generated within the metal and resistance leads to Joule heating of the metal. ...
Zone melting is a method of separation by melting in which a series of molten zones traverses a long ingot of impure metal or chemical. ...
History The induction coil was discovered during early experiments with electricity, probably by Nicholas Callan in 1836, and further refined by Heinrich Ruhmkorff. Induction coils were used to provide high voltage used for early gas discharge, Crookes tube, and X-ray research. They were also used to provide entertainment (such as lighting Geissler tubes) and to drive small "shocking coils" and Violet ray devices used in quack medicine. Nicholas Callan (1799 – 1864) Irish physicist, invented the induction coil in 1836. ...
Heinrich Daniel Ruhmkorff (January 15, 1803 – December 20, 1887) was a German instrument maker who developed and commercialised the induction coil (often referred to as the Ruhmkorff coil. ...
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The Crookes tube is an evacuated glass cone with 3 node elements (one anode and two cathodes). ...
In the NATO phonetic alphabet, X-ray represents the letter X. An X-ray picture (radiograph) taken by Röntgen An X-ray is a form of electromagnetic radiation with a wavelength approximately in the range of 5 pm to 10 nanometers (corresponding to frequencies in the range 30 PHz...
The Geissler tube is a glass tube for demonstrating the principles of electrical discharge. ...
A violet ray or violet wand is a quack medical device used for the application of low current, high frequency electricity to the body using a Tesla coil for purposes electrotherapy. ...
Quackery is the practice of fraudulent medicine, usually in order to make money or for ego gratification and power. ...
This type of disruptive discharge coil remains in common use as the ignition coil or "spark coil" in the ignition system of internal combustion engines. A smaller version is used to trigger the flash tubes used in cameras and strobe lights. They were used by Hertz to demonstrate electromagnetic waves existed, as predicted by James Maxwell, and by Tesla and Marconi in early wireless telegraphy. They were supplanted in wireless or radio work by vacuum tubes by 1920. Since the mid-1960's these coils have also been used for Induction Sealing . An ignition coil (also called a spark coil) is an electrical device in a automobiles ignition system which transforms a storage batterys 12 volts to the thousands of volts needed to spark the spark plugs. ...
The ignition system of an internal-combustion engine is an important part of the overall engine system that provides for the timely burning of the fuel mixture within the engine. ...
The internal combustion engine is an engine in which the burning of a fuel occurs in a confined space called a combustion chamber. ...
Xenon flash lamp being fired. ...
U-shaped Xenon Flash Lamp A xenon flash lamp is a gas discharge lamp designed to produce extremely intense, incoherent, full-spectrum white light for very short durations. ...
Heinrich Rudolf Hertz (February 22, 1857 - January 1, 1894) was the German physicist and mechanician for whom the hertz, an SI unit, is named. ...
James Clerk Maxwell (13 June 1831 – 5 November 1879) was an important mathematician and theoretical physicist. ...
Nikola Tesla (1856-1943)[1] was a world-renowned Serbian inventor, physicist, mechanical engineer and electrical engineer. ...
Guglielmo Marchese Marconi, GCVO (25 April 1874-20 July 1937) was an Italian inventor, best known for his development of a practical radiotelegraph system, which served as the foundation for the establishment of numerous affiliated companies worldwide. ...
In electronics, a vacuum tube or (outside North America) thermionic valve or just valve, is a device generally used to amplify, switch or otherwise modify, a signal by controlling the movement of electrons in an evacuated space. ...
Induction sealing, otherwise known as cap sealing, is a non-contact method of heating a metallic disk to Hermetically seal the top of plastic and glass containers. ...
See also The spark gap transmitter was the first practical way to send radio signals. ...
For other uses, see transformers. ...
Tesla Coil at Questacon, the Australian National Science Centre museum A Tesla coil is a category of disruptive discharge transformer coils, named after their inventor, Nikola Tesla. ...
An ignition coil (also called a spark coil) is an electrical device in a automobiles ignition system which transforms a storage batterys 12 volts to the thousands of volts needed to spark the spark plugs. ...
Further reading - Norrie, H. S., "Induction Coils: How to Make, Use, and Repair Them". Norman H. Schneider, 1907, New York. 4th edition.
- Faraday M (1834): Experimental researches on electricity, 7th series. Phil. Trans. R. Soc. (Lond.) 124: 77-122.
External links - Battery powered Driver circuit for Induction Coils
- The Cathode Ray Tube site
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