Inductance

Good explanation by Jon. Only thing I can add is that the magnetic
fiield generated in the windings acts as a kind of resistor because
there is self induced backward current working against the forward
current. Because the phenonmenon is different from normal resistor
heating , the effect is called inductive reactance. This inductive
reactance causes the current through the inductor to lag behind the
voltage across it by 90 degrees. Also, inductors do not like to pass
high frequency signals. To see a good explantion with a mathematical
treatment of inductance, see Paul Sherz "Practical Electronics for
Inventors".

Cordially, Penn King
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