Information about Induction Coil
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Ruhmkorff coil.
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 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.
History
The induction coil was discovered during early experiments with electricity, by Nicholas Callan in 1836 at the St. Patrick's College, 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 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.Early patents
- U.S. Patent 52,054 The induction-coil, instead of being made movable upon the magnet
- U.S. Patent 72,616 This compound coil is made like any ordinary induction-coil
- U.S. Patent 74,905 The inner end of the induction-coil are surrounded by the prime coil
- U.S. Patent 76,654 The induction-coil consists of a metallic conductor, copper is generally preferred
- U.S. Patent 78,495 Energizing the primary wire of the induction-coil, the iron core becomes magnetized
- U.S. Patent 90,626 Making use of an induction-coil
- U.S. Patent 734,197 a split-coil improvement (1903).
- U.S. Patent 1,092,417 Induction coil comprising a soft iron core (Mar 5, 1913)
See also
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
In language, an archaism is the use of a form of speech or writing that is no longer current. This can either be done deliberately (to achieve a specific effect) or as part of a specific jargon (for example in law) or formula (for example in religious contexts).
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electrical breakdown has several similar but distinctly different meanings. The term may apply to a failure of an electric circuit or system with consequent lack of function.
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Direct current (DC or "continuous current") is the constant flow of electric charge. This is typically in a conductor such as a wire, but can also be through semiconductors, insulators, or even through a vacuum as in electron or ion beams.
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A coil is a series of s. A coiled coil is a structure where the coil itself is in turn also looping.
A coil is made up of materials, usually rigid, which can be fashioned into a spiral or helical shape.
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General applications
A coil is made up of materials, usually rigid, which can be fashioned into a spiral or helical shape.
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Electric current is the flow (movement) of electric charge. The SI unit of electric current is the ampere (A), which is equal to a flow of one coulomb of charge per second.
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Definition
The amount of electric current (measured in amperes) through some surface, e.g...... Click the link for more information.
An inductor is a passive electrical device employed in electrical circuits for its property of inductance. An inductor can take many forms.
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Physics
Overview
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high voltage characterizes electrical circuits, in which the voltage used is the cause of particular safety concerns and insulation requirements. High voltage is used in electrical power distribution, in cathode ray tubes, to generate X-rays and particle beams, to demonstrate
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For magnetic induction, see .
Electromagnetic induction is the production of voltage across a conductor situated in a changing magnetic field or a conductor moving through a stationary magnetic field...... Click the link for more information.
volt (symbol: V) is the SI derived unit of electric potential difference or electromotive force.[1][2] It is named in honor of the Italian physicist Alessandro Volta (1745–1827), who invented the voltaic pile, the first modern chemical battery.
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Electrostatic discharge (ESD) is the sudden and momentary electric current that flows between two objects at different electrical potentials. The term is usually used in the electronics and other industries to describe momentary unwanted currents that may cause damage to
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The word spark has several meanings:
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- In electricity, "spark" usually refers to a momentary electrostatic discharge across a spark gap. It can also refer to a continuous electric arc or a corona discharge.
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alternating current (AC) is an electrical current whose magnitude and direction vary cyclically, as opposed to direct current, whose direction remains constant. The usual waveform of an AC power circuit is a sine wave, as this results in the most efficient transmission of
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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.
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Zone melting is a method of separation by melting in which a molten zone traverses a long ingot of impure metal or chemical. In its common use for purification, the molten region melts impure solid at its forward edge and leaves a wake of purer material solidified behind it as it
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Nicholas Callan (20 December 1799 – 14 January 1864), an Irish physicist, invented the induction coil in 1836. Callan was a Roman Catholic priest and the professor of natural philosophy at St Patrick's College, Maynooth, from 1826 until his death.
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National University of Ireland, Maynooth (NUIM) was founded in 1997 by the Universities Act, 1997 as a constituent university of the National University of Ireland.
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Heinrich Daniel Ruhmkorff (January 15, 1803 – December 20, 1877) was a German instrument maker who commercialised the induction coil (often referred to as the Ruhmkorff coil.)
Ruhmkorff was born in Hanover.
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Ruhmkorff was born in Hanover.
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Gas discharge lamps are a family of artificial light sources that generate light by sending an electrical discharge through an ionized gas, i.e. a plasma. The character of the gas discharge critically depends on the frequency or modulation of the current: see the entry on a
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The Crookes tube is an evacuated glass cone with 3 node elements (one anode and two cathodes). It is an invention of the 19th century scientist William Crookes and is an evolutionary development of the earlier Geissler tube.
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X-rays (or Röntgen rays) are a form of electromagnetic radiation with a wavelength in the range of 10 to 0.01 nanometers, corresponding to frequencies in the range 30 PHz to 30 EHz. X-rays are primarily used for diagnostic radiography and crystallography.
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The Geissler tube is a glass tube for demonstrating the principles of electrical discharge. The tube was invented by the German physicist and glassblower Heinrich Geissler in 1857. The Geissler tube was an evacuated glass cylinder with an electrode at each end.
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A violet ray or violet wand is a device used for the application of low current,high voltage (min 10kV to max 50kV typically), high frequency electricity to the body using a Tesla coil, originally sold as a supposed medical device claimed to be useful in electrotherapy,
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Quackery is a derogatory term used to describe questionable medical practices. According to Random House Dictionary, a "quack" is considered a "fraudulent or ignorant pretender to medical skill" or "a person who pretends, professionally or publicly, to have skill,
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ignition coil (also called a spark coil) is an induction coil in an automobile's ignition system which transforms the battery's 12 volts (6 volts in some older vehicles) to the thousands of volts needed to spark the spark plugs.
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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. All conventional petrol (gasoline) engines require an ignition system.
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The internal combustion engine is an engine in which the combustion of fuel and an oxidizer (typically air) occurs in a confined space called a combustion chamber. This exothermic reaction creates gases at high temperature and pressure, which are permitted to expand.
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xenon flash lamp is an electric glow discharge lamp designed to produce extremely intense, incoherent, full-spectrum white light for very short durations.
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Construction
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strobe light or stroboscopic lamp, commonly called a strobe, is a device used to produce regular flashes of light. It is one of a number of devices that can be used as a stroboscope.
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Heinrich Rudolf Hertz
Born January 22 1857
Hamburg, Germany
Died January 1 1894 (aged 38)
Bonn, Germany
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Born January 22 1857
Hamburg, Germany
Died January 1 1894 (aged 38)
Bonn, Germany
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James Clerk Maxwell
James Clerk Maxwell
Born May 13 1831
Edinburgh, Scotland
Died November 5 1879 (aged 48)
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James Clerk Maxwell
Born May 13 1831
Edinburgh, Scotland
Died November 5 1879 (aged 48)
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