A coil is a series of loops. A coiled coil is a structure where the coil itself is in turn also looping.
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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. Flexible materials like wire, rope, hose, cable or paper can also be coiled into empty loops, or wound around a central drum or spindle.
Some common applications of coils include:
- A coil spring is the most common type of spring.
- A spiral staircase, a stairway fashioned in a coil shape.
- A Slinky is a coil-shaped toy.
- Evaporator coils are used in air conditioning and other refrigeration cycles.
- A boiler coil is an element in a water heater.
- An Alpine coil, one of several coil knots, is a method for carrying a rope.
- Quilling coils use shaped paper to create artistic designs.
Electromagnetic coils
Main: Electromagnetic coil

Analysis
The inductance of single-layer coils can be calculated to a reasonable degree of accuracy with the simplified formula
Coil examples

- A bifilar coil is a coil that employs two parallel windings.
- A Barker coil is used in low field NMR imaging.
- A Balun is set of transformer coils for transmission lines.
- A Braunbeck coil is used in geomagnetic research.
- A degaussing coil is used in the process of removing permanent magnetism (magnetic hysteresis) from an object.
- A choke coil (or choking coil) is low-resistance inductor used to block alternating current while passing direct current.
- A Flat coil is used in thin electric motor.
- A Garrett coil is used in metal detectors.
- A Helmholtz coil is a device for producing a region of nearly uniform magnetic field.
- A hybrid coil (or bridge transformer) is a single transformer that effectively has three windings.
- An induction coil (or ignition coil) is an electrical device in common use as the ignition system (ignition coil or spark coil) of internal-combustion engines.
- A loading coil is, in electronics, a coil (inductor) inserted in a circuit to increase its inductance. Archaically called Pupin coils.
- A multiple coil magnet is an electromagnet that has several coils of wire connected in parallel.
- A Maxwell coil is a device for producing almost a constant magnetic field.
- A Micro coil use in security devices.
- A Oudin coil is a disruptive discharge coil.
- The polyphase coils are connected together in a polyphase system such as a generator or motor.
- A relay coil is the copper winding part of a relay that produces a magnetic field that actuates the mechanism.
- A Repeating coil is a voice-frequency transformer.
- A Rogowski coil is an electrical device for measuring alternating current.
- A single coil is a type of pickup for the electric guitar.
- A solenoid is a mechanical device, based around a coil of wire, that usually converts energy into linear motion, however solenoids also come in a rotary motion (normally up to a turn of 90 degrees).
- A telephone cord is usually manufactured in a coiled fashion, as to allow maximum length while taking up minimum space when not in use.
- A Tesla coil is category of disruptive discharge coils, usually denoting a resonant transformer that generates very high voltages at radio frequencies.
- A voice coil which is mounted to the moving cone of a loudspeaker.























