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....
[1] The course is
just trying to take away some of the black-box mystery of the
instruments they use.
[2] But this is one data point where students indeed
have some difficulty with the notion of using some diodes forward biased
and other diodes reverse biased.
From the Car Talk book, I often quote the passage from the beginning of
the chapter on automotive electrical circuits. Tom and Ray say that
space is not the final frontier (as said in the opening of Star Trek
episodes), they say electricity is the final frontier because people
don't know diddly about it.