[Elecraft] Voltage drop in DX Power to K3

[Jim Brown]

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