A coil is a series of loops.


General applications

Missing image
A helical spring.

A coil is made of rigid materials which can fashioned into a spiral or helical shape. Flexible materials like wire, rope, hose, or cable can also be coiled into empty loops, or wound around a central drum or spindle.

Some common applications of coils include:

See also: list of coil knots


Typical transformer configurations
Typical transformer configurations

In electrical engineering, a electromagnetic coil is formed when a metallic or conductive wire is looped around a core to create an electronic inductor or electromagnet. A transformer coil has a primary coil and a secondary coil that transfers energy from one electrical circuit to another by magnetic coupling without moving parts. An extra coil (sometimes referred to as a tickler coil) is usually a third coil placed in relation to a primary coil and secondary coil.

Some common electromagnetic coils include:

Further reading

  • Querfurth, William, "Coil winding; a description of coil winding procedures, winding machines and associated equipment for the electronic industry" (2d ed.). Chicago, G. Stevens Mfg. Co., 1958.
  • Weymouth, F. Marten, "Drum armatures and commutators (theory and practice) : a complete treatise on the theory and construction of drum winding, and of commutators for closed-coil armatures, together with a full résumé of some of the principal points involved in their design; and an exposition of armature reactions and sparking". London, "The Electrician" Printing and Publishing Co., 1893.
  • "Coil winding proceedings". International Coil Winding Association.
  • Chandler, R. H., "Coil coating review, 1970-76". Braintree, R. H. Chandler Ltd, 1977.


 RNA coil on the left and DNA coil on the right.
RNA coil on the left and DNA coil on the right.

In the study of how molecules interact with each other, there are a few specific references to organic coils. During self-assembly, organic elements organize to form this structural pattern. Molecular self-assembly assembles the molecules, without guidance or management from an outside source, into these shapes.

Examples of these structural patterns include:

As an acronym, COIL denotes the Chemical Oxygen Iodine Laser.

Other uses

Musician names

"Coil" is, or is part of, the name for some musicians or their albums.



cs:Cívka (rozcestník)

da:Spole de:Spule pt:Bobine ja:巻線


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