Stamping Instruction, Patterns

A coil is a series of loops. more...

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General applications

A coil is made of materials, usually rigid, which can be 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:

A coil spring is the most common type of spring.; A set of stairs fashioned in a coil shape, which are called spiral staircases.; 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.; A Alpine coil, one of several coil knots, is a method for carrying a rope.;

Electromagnetic

In electrical engineering, an electromagnetic coil is formed when a metallic or conductive wire is looped around a core to create an electronic inductor or electromagnet. One loop of wire is usually referred to as one turn. A coil consists of one or more turns. For use in an electronic circuit, electrical connection terminals called taps are often connected to a coil. Coils are often coated with varnish and/or wrapped with insulating tape to provide additional insulation and secure them in place. A completed coil assembly with taps etc. is often called a winding. A transformer is an electromagnetic device that has a primary winding and a secondary winding that transfers energy from one electrical circuit to another by magnetic coupling without moving parts. The term tickler coil usually refers to a third coil placed in relation to a primary coil and secondary coil. A coil tap is a wiring feature found on some electrical transformers, inductors and coil pickups, all of which are sets of wire coils. The coil tap(s) are points in a wire coil where a conductive patch has been exposed (usually on a loop of wire that extends out of the main coil body).

Some common electromagnetic coils include:

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 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 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 converts energy into linear motion.; 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.;

Read more at Wikipedia.org