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How do Inductors Work?

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Whereas a resistor opposes (restricts) a flow of current, an inductor opposes a change of flow of current.
So, it allows the current to flow freely, but it will not let the current flow change rapidly. There is a delay and the change occurs more slowly than it would if the inductor were not in circuit.

 

inductor

A small inductor might look very much like a resistor. It will measure almost short-circuit because it is simply a few turns of wire.

inductor

Larger inductors can be seen to be coils of copper wire insulated with varnish

inductor

Inductors with even more turns are often called "chokes".

inductor

Some inductors have an opaque insulating sleeve. This sleeve is made from polyolefin which shrinks when heated.

inductor

This is a high frequency coil from a radio

shielded adjustable inductor

A tiny coil with a metal screening can and an adjustable screw core

shielded adjustable inductor

A small coil with a metal screening can and an adjustable screw core

adjustable inductor

A small coil without a screening can

toroidal inductor

A toroidal inductor is very efficient and does not radiate very much energy

small transformer with laminated core

A larger choke is wound on soft iron laminations in the shape of "E" and "I".
This one looks very much like a transformer but is clearly a choke since it has only two connections. A transformer needs at least three.

ferrite screw core

A screw core made of compressed powdered iron called "ferrite".

A ferrite bead. When insulated wire is threaded through, it becomes an inductor.

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