Induction Coil

Induction Coil Design
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Induction coil - Wikipedia, the free encyclopedia
Ritchie's induction coil proved superior to other designs of the day, initially ... U.S. Patent 52,054 The induction-coil, instead of being made movable upon ...
en.wikipedia.org

Induction coil - Wikipedia, the free encyclopedia
So the output waveform of an induction coil is a series of alternating positive ... U.S. Patent 76,654 The induction-coil consists of a metallic conductor, copper ...
en.wikipedia.org




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An Induction coil or "spark coil" (archaism 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 Direct current supply.

Description An induction coil 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 to rapidly connect and break current flowing into the primary coil.

The term "Induction coil" is also used for a coil carrying high-frequency Alternating current and intended to induce eddy currents to heat objects placed in the interior of the coil, such as in induction heating or zone melting.

History The induction coil was discovered during early experiments with electricity, by Nicholas Callan in 1836 at the National University of Ireland, Maynooth, and further refined by Heinrich Ruhmkorff and others. 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.A 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 xenon flash lamps used in cameras and strobe lights. They were used by Heinrich Rudolf Hertz to demonstrate electromagnetic waves existed, as predicted by James Clerk Maxwell, and by Nikola Tesla and Guglielmo Marconi in early wireless telegraphy. They were supplanted in wireless or radio work by vacuum tubes by 1920. Early patents

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Induction coil - Wikipedia, the free encyclopedia
An Induction coil or "spark coil" (archaically known as a Ruhmkorff coil) is a type of disruptive discharge coil. It is a type of electrical transformer used to produce high ...

Ignition system - Wikipedia, the free encyclopedia
The engine operates contact breaker points, which interrupt the current to an induction coil (known as the ignition coil). The ignition coil consists of two transformer windings ...

AskOxford: induction coil
induction coil • noun a coil for generating intermittent high voltage from a direct current. Perform another search of the Compact Oxford English Dictionary

The Induction Coil
The Induction Coil "Now does my project gather to a head My charms crack not, my spirits obey, and time Goes upright with his carriage. How's the day?"

induction coil
Type of electrical transformer, similar to an ignition coil, that produces an intermittent high-voltage alternating current from a low-voltage direct current supply. It has a ...

Induction coil definition of Induction coil in the Free Online ...
Induction coil. A device for producing a high-voltage alternating current or high-voltage pulses from a low-voltage direct current. The largest modern use of the induction coil is ...

induction coil - Hutchinson encyclopedia article about induction coil
induction coil. Type of electrical transformer, similar to an ignition coil, that produces an intermittent high-voltage alternating current from a low-voltage direct current supply ...

Induction Coil
Induction Coils A. The Original Induction Coils. The original induction coil was invented in 1836 by Nicholas Callan (1799-1864), a priest and the professor of natural ...

COIL INDUCTION - GPO/BT/PO/BPO
Coil Induction No. 12: Coil Induction No. 13 : Coil Induction No. 14A. Two windings of 26 Ohms (1400 turns & 17 Ohms (1700 turns). Also two non-inductive resistances of 50 Ohms and ...

induction coil - definition of induction coil by the Free Online ...
A transformer, often used in automotive ignition systems, in which an interrupted, low-voltage direct current in the primary is converted into an intermittent, high-voltage current ...





 
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