coil


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coil:

see inductorinductor,
electric device consisting of one or more turns of wire and typically having two terminals. An inductor is usually connected into a circuit in order to raise the inductance to a desired value.
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; solenoidsolenoid
, device made of a long wire that has been wound many times into a tightly packed coil; it has the shape of a long cylinder. If current is sent through a solenoid made of insulated wire and having a length much greater than its diameter, a uniform magnetic field will be
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.

Coil

One or more turns of wire used to introduce inductance into an electric circuit. At power line and audio frequencies a coil has a large number of turns of insulated wire wound close together on a form made of insulating material, with a closed iron core passing through the center of the coil. This is commonly called a choke and is used to pass direct current while offering high opposition to alternating current.

At higher frequencies a coil may have a powdered iron core or no core at all. The electrical size of a coil is called inductance and is expressed in henries or millihenries. In addition to the resistance of the wire, a coil offers an opposition to alternating current, called reactance, expressed in ohms. The reactance of a coil increases with frequency. See Inductor

coil

[kȯil]
(control systems)
Any discrete and logical result that can be transmitted as output by a programmable controller.
(electromagnetism)
A number of turns of wire used to introduce inductance into an electric circuit, to produce magnetic flux, or to react mechanically to a changing magnetic flux; in high-frequency circuits a coil may be only a fraction of a turn. Also known as electric coil; inductance; inductance coil; inductor.
(science and technology)
An arrangement of flexible material into a spiral or helix.

Coil

One or more turns of wire used to introduce inductance into an electric circuit. At power line and audio frequencies a coil has a large number of turns of insulated wire wound close together on a form made of insulating material, with a closed iron core passing through the center of the coil. This is commonly called a choke and is used to pass direct current while offering high opposition to alternating current.

At higher frequencies a coil may have a powdered iron core or no core at all. The electrical size of a coil is called inductance and is expressed in henries or millihenries. In addition to the resistance of the wire, a coil offers an opposition to alternating current, called reactance, expressed in ohms. The reactance of a coil increases with frequency. See Inductor, Reactor (electricity)

heat exchanger

A device designed to transfer heat between two physically separated fluids; generally consists of a cylindrical shell with longitudinal tubes; one fluid flows on the inside, the other on the outside.

coil

1. an electrical conductor wound into the form of a spiral, sometimes with a soft iron core, to provide inductance or a magnetic field
2. the transformer in a petrol engine that supplies the high voltage to the sparking plugs
References in classic literature ?
Here he came, like a house afire; I dodged: he passed like a flash, with my horse-hair coils settling around his neck; a second or so later, FST
At dawn she got up and went listlessly and sat down on the cable coil again.
With the success of the Pupin coil, there came a larger life for the telephone.
I then gathered in the rope you were sending me, and making a coil or pile of it I seated myself upon it, ruminating and considering what I was to do to lower myself to the bottom, having no one to hold me up; and as I was thus deep in thought and perplexity, suddenly and without provocation a profound sleep fell upon me, and when I least expected it, I know not how, I awoke and found myself in the midst of the most beautiful, delightful meadow that nature could produce or the most lively human imagination conceive.
Now he held a single coil of the long rope in his right hand, and the balance in his left.
Then I got a big pebble from the river, and came and hammered till I had flattened a coil in the decorations, and the verdigris came off in powdery flakes.
Pres- ently some chance whim came to the pestering blur, and it began to coil heavily away.
At this moment, as if in reply to his words, a man lying on a coil of cables rose and advanced a few steps toward him.
The Californian horsemen seldom ride out without the laso [sic]; that is to say, a long coil of cord, with a slip noose; with which they are expert, almost to a miracle.
Some of these tapers are eight or ten feet in length; but being perfectly flexible, one end is held in a coil, while the other is lighted.
Instinctively he lowered himself in the water, only raising his head to breathe from time to time, and Kaa came to anchor with a double twist of his tail round a sunken rock, holding Mowgli in the hollow of a coil, while the water raced on.
He stood there, patient and considering, with his small neat foot on a coil of rope, his back to everything that had been disembarked, his neck elongated in its polished cylinder, while the fragrance of his big cigar mingled with the odour of the rotting piles, and his little sister, beside him, hugged a huge post and tried to see how far she could crane over the water without falling in.