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The difference between impedance and resistance

My Dad would be ashamed for me for writing this thread (he had a background in electrical engineering) but can someone explain the differnce between impedance and resistance (other than the former is for ac and the latter dc) as it pertains to audio circuitry?
russellrcncom
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musicnoise
377 posts
 
Bob: While reading the links keep in mind that the 'phase' difference is a way of describing the special case of the transfer function for a system when the input a sine wave and where the transients have died out (steady state).
aball
2,018 posts
 
Bob - the difference between the derivative in radians and degress is the scalar multiplier of k*pi. The key thing to note in my description is the word "directly". I found this description that should go into enough detail for you to understand what I was saying:

http://mathforum.org/library/drmath/view/54181.html

As for lead and lag, you can do a search for "ELI the ICE man" and the first few links that pop up offer good explanations.

Arthur
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shadorne
7,477 posts
 
As to inductance the motion of a charge (which is current) causes a magnetic field.

Agreed. And the magnetic field can be shown to be a relativistic effect (Einstein - special relativity) of the pure electrical field. It all depends on your frame of reference.
6550c
393 posts
 
To dumb it down.

Resistance(R) => DC circuits design.
Impedance(Z) => AC circuits design.

Impedance includes resistance(R) + capacitance(C) OR - inductance(L). (BUT you cant have C and L at the same time)
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