Ok,

This is really just an electronics question.  I hope that one of the
experts on this list will take the time to enlighten me a little.  I have
been struggling with truly understanding the concept of impedance. More
importantly, I don't understand the role it plays in the behavior of any
given circuit.  As a newbie, I sometimes try to picture the electrons
racing through a conductor, and how a component affects the behavior of
that electron.  For instance, I understand the concept of resistance ( at
least to some degree ) and ( to a lesser degree ) the concept of
capacitance.

Impedance is resistance to change ( correct ? ). To this end, I believe the
older I get the higher my impedance <g>.  Anyway, impedance is a term that
is used here on this list ( and elsewhere ) frequently in discussing all
aspects of circuit design and troubleshooting.  I thought if I read enough
that eventually I would gain a better understanding of the term by seeing
how it was used in everyday electronics problem solving.  Alas, this hasn't
happened.

Please enlighten me, oh great ones <g>.

Eric