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Impedance defines the voltage/current characteristic of any dipole circuit.

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That is correct. The 50 ohm impedance refers to the "characteristic impedance" of the "transmission line". This comes from electromagnetic theory and is usually applicable to RF and high frequency … applications. At DC your trace will still be very low impedance (resistance). If you were to take an ohmmeter to it you would probably measure maybe 1 ohm or 0.5 ohm, and that is only because the probe …
answered Apr 4 '11 by Adam P