An electromagnetic coil consists of a conductor and a core, commonly made of copper wire and metal. It stores energy in its magnetic field and is measured in units of Henry. Coils must have terminals connected to the wire, and when two are placed together, it is called a transformer. Electromagnetic coils are also used as magnetic pickups in musical instruments.
An electromagnetic coil is a device made up of two distinct elements: a conductor and a core. The conductor is most commonly made of solid copper wire, which is wound around a solid metal core. Each time the wire is wrapped around the core, it is called a turn. Multiple turns are considered one coil.
The most common use of an electromagnetic coil is as an inductor that stores energy within its magnetic field. Considered a passive electrical component, an inductor has no gain and cannot control the directional flow of energy. The way an inductor harnesses energy is by electric current passing through its body.
This reaction is due to Faraday’s law of induction, which states that “the induced electromotive force or EMF within a closed loop is equal to the rate of change of the magnetic flux through the loop.” As one of the basic components of electronics, inductors delay and reshape alternating currents. The magnetic energy in an electromagnetic coil is measured in units of Henry, named after Joseph Henry, an American inventor.
To work in a circuit, electromagnetic coils must have terminals connected to the wire. These terminals are called faucets. Faucets are usually coated with paint or wrapped in some form of electrical tape. This helps keep electricity from escaping the electromagnetic coil and also secures them in place. The electromagnetic coil with plugs at both ends is called a winding.
When two electromagnetic coils are placed together, it is called a transformer. This provides the ability to transfer energy between two electrical circuits through magnetic coupling. Essentially, electricity can be transferred from one circuit to another without the use of moving parts. When a third electromagnetic coil is placed in close proximity to the transformer, energy can be transferred further. This third coil is called the tickle coil.
One of the most popular uses for electromagnetic coils outside of inductors and transformers is as magnetic pickups in musical instruments such as electric guitars. Tiny cores with permanent magnetism are wound in a few thousand coils of fine copper wire. Metal strings with a slight magnetism are vibrated near the coils creating a magnetic flux which, in turn, creates an alternating current through the wire. This signal is carried via a cable and amplified in a speaker or recorded.
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