Coils

Overview of coils in various contexts

 This article is about the general concept of coils.
   For other uses, see Coil (disambiguation).

A coil is a series of loops. The term is used in many contexts, including electromagnetism, mechanical engineering, and medicine. Coils can be found in various devices and systems, each serving a specific function based on its design and application.

Electromagnetic Coils

A solenoid, a type of electromagnetic coil

An electromagnetic coil is an electrical conductor such as a wire in the shape of a coil, spiral, or helix. Electromagnetic coils are used in electrical engineering, in applications where electric currents interact with magnetic fields, in devices such as inductors, transformers, electric motors, and generators.

Inductors

An inductor is a passive electronic component that stores energy in its magnetic field. Inductors are typically made of a wire or other conductor wound into a coil. They are used in various electronic circuits, particularly in radio frequency applications.

Transformers

A transformer is a device that transfers electrical energy between two or more circuits through electromagnetic induction. A varying current in the transformer's primary coil creates a varying magnetic flux, which induces a varying electromotive force (EMF) or voltage in the secondary coil.

Electric Motors and Generators

Electric motors and generators use coils to convert electrical energy into mechanical energy and vice versa. In motors, electric current through the coil generates a magnetic field that interacts with the magnetic field of the stator, producing motion. In generators, mechanical motion induces an electric current in the coil.

Mechanical Coils

File:Compression spring.jpg

A compression spring

In mechanical engineering, a coil often refers to a spring or a helical structure. These coils are used to store mechanical energy and absorb shock or maintain force between contacting surfaces.

Compression Springs

A compression spring is designed to operate with a compressive load, so the spring gets shorter as the load is applied. These springs are commonly used in various mechanical devices, including automobiles, machinery, and consumer products.

Torsion Springs

A torsion spring works by twisting its ends along its axis. This type of spring is used in applications such as clocks, watches, and mouse traps.

Medical Coils

In medicine, coils are used in various diagnostic and therapeutic procedures.

Embolization Coils

Embolization coils are used in interventional radiology to treat aneurysms and other vascular conditions. These coils are inserted into a blood vessel to block blood flow to a particular area, reducing the risk of rupture or bleeding.

MRI Coils

Magnetic resonance imaging (MRI) uses coils to generate and receive radiofrequency signals. These coils are essential for producing detailed images of the body's internal structures.

Related Pages

• Electromagnetism
• Electrical engineering
• Mechanical engineering
• Inductor
• Transformer
• Electric motor
• Generator
• Spring (device)
• Embolization
• Magnetic resonance imaging

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