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That's what I've been trying to say all along. I would probably reword his
statement say "We have to determine why the device has a potential
difference across it." A battery has a potential difference across it
because of an electrochemical reaction, not because of I*R. A capacitor has
a potential difference across it because V = Q/C, not because if I*R. A
reverse-biased zener diode has a potential difference across it because the
potential difference is required to get breakdown and obtain charge carriers
at the junction, not because of I*R. Whether you use Robert's words or
mine, the conclusion is the same... don't calculate a resistance for these
devices using R = V/I... it is inappropriate to assign a resistance to these
devices.