I wouldn't expect useful accuracy from anything but a lab instrument for
such low resistances as a few feet of #12. Far better to look up the
resistance of copper wire from a wire table. An unknown "black box" like
a power strip is not so easy. :) As for the protection diode, that's
pretty easy too -- look up the junction voltage for that type of diode,
and you're within 0.1 volt of reality.
The thing I find baffling (or depressing) here is that we all had to
understand Ohm's Law to pass the exam for our license, and it's REAL
simple. Take resistance values from a wire table, multiply by the
length, then by two for the two conductors, then by the current. I dunno
what the exam is like nowadays -- my experience was 1955 with the Novice
test and a year later with the General -- but surely there must be
something about how diodes work!
73, Jim K9YC
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