Coil

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

In electrical engineering, a coil is formed when a metal wire is coiled around a core to create an electronic inductor or electromagnet. Polyphase coils are coil systems with multiple phases.

See also:

In music

• Coil is a British experimental band.
• Coil is a 1997 album by American band Toad the Wet Sprocket.
• Lacuna Coil is an Italian goth heavy metal band.
• This Mortal Coil is a British dark cover band.

In sciences and mechanics

• COIL is an acronym for Chemical Oxygen Iodine Laser
• An induction coil is an electrical device in common use as the ignition system (ignition coil or spark coil) of internal-combustion engines.
• A Tesla coil is a resonant transformer that generates very high voltages at radio frequencies.
• A coil spring is the most common type of spring.
• A solenoid is a mechanical device, based around a coil of wire, that converts energy into linear motion.

In other domains

• A list of coil knots.
• A coil stamp is a type of postage stamp sold as strips one stamp wide.
• A Slinky is a coil-shaped toy.