What is an inductor?
An inductor is an electrical device, which can temporarily store electromagnetic energy in the field about it as long as current is flowing through it. The inductor is a coil of wire that may have an air core or an iron core to increase its inductance. A powered iron core in the shape of a cylinder may be adjusted in and out of the core.
An inductor tends to oppose a change in electrical current, it has no resistance to DC current but has an AC resistance current, known as inductive reactance, this inductive reactance is affected by inductance and the AC frequency and is given by the formula XL=2πfLL, with units of ohms. Inductors are used for filtering AC current, increasing the output of RF (radio frequency) amplifier.
Inductors are available in variety of shapes : air core, iron core (which may look like a transformer, but has only two leads), toroidal (doughnut shaped), small tubular with epoxy, RF choke with separate coils on cylinder, and tunable RF coil with a screwdriver adjustment.
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