David, great explanation, but one thing has me puzzled: Under what
circumstances would electricity seem analogous to a compressible
fluid, as opposed to non-compressible? I read those WWII US Navy basic
electricity books, probably about the same time you did, but I recall
them using water as a comparison. It's still stuck in my mind that
way...

And I never knew what a coulomb actually was...Avogadro strikes again!

Gary