coil a structure consisting of something wound in a continuous series of loops; "a coil of rope"
induction coil a coil for producing a high voltage from a low-voltage source
primary coil,
primary winding,
primary coil forming the part of an electrical circuit such that changing current in it induces a current in a neighboring circuit; "current through the primary coil induces current in the secondary coil"
tesla coil a step-up transformer with an air core; used to produce high voltages at high frequencies
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Wiktionary
Substantiv
transformer -
Something that transforms, changing its own or another thing's shape.
transformer -
A static device that transfers electric energy from one circuit to another by magnetic coupling. Their main use is to transfer energy between different voltage levels, which allows choosing most appropriate voltage for power generation, transmission and distribution separately.
Wikipedia
A transformer is a device that transfers electrical energy from one circuit to another through inductively coupled conductors—the transformer's coils. A varying current in the first or primary winding creates a varying magnetic flux in the transformer's core, and thus a varying magnetic field through the secondary winding. This varying magnetic field induces a varying electromotive force (EMF) or "voltage" in the secondary winding.
