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Originally Posted by Kuan
Uh, nope. We're not talking resistance, we're talking impedance, a function of frequency and resistance, and EMF isn't transmitted, it's picked up. The whole system is one big antenna. We're talking RF here, a whole different set of equations.
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My poor choice of words. I think the concept still stands and I don't think we're saying different things.
The wire acts as an antenna to EMF broadcast from every device known to man and god. Usually 60hz is the big humming culprit. The smaller the wire diameter the higher the resistence and impedence. The impedence is increased by decreasing the size of the wire, I think. I don't think it is linear, is it? So anyway, I think that you can make a low pass filter of a sort by sending your signal down a narrow wire. Low freq moves relatively 'unimpeded' while high freqency gets attenuated and heats the wire.
(Impedence is also measured in ohms but is, I think, related to the work necessary to create a field perpendicular to the wire. I'm gonna read the link that
MikeMover provided. I have a feeling it will make all of this moot.)