Chapter 9 - Circuit Schematic Symbols

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An inductor is a passive two-terminal electrical component that stores in a magnetic field when current flows through it.

It is also called a choke, coil or reactor. There are two main classifications of inductors, air core and iron core.

Shown above are common types of inductors that are readily available. 

The air core inductor does not necessarily mean that it does not have a core, it just not use magnetic core.

It uses ceramic, plastic, or other non-magnetic material. Iron core inductor on the other hand is an inductor that have iron as a core. 

Other types of inductor are variable and tapped inductor. Variable inductor is used vary the inductantance of the inductor depending on the desired value.

A tapped inductor is a coil to which electrical access is available at more points, transformers are an example of tapped inductor.