Brady worked with me at CtiNetworks nee PA.net, but he's since moved on to KLN, as have many people once at CtiNetworks. I have to admit that he put up with a bunch of stupid questions from me quite admirably, back when I was trying to fill in my (lack of) understanding of electricity. Speaking of which, the best visual key I've seen for electricity is the Photoelectric effect (more light/lumens = more amps, higher frequency light = higher voltage), and there's a good online electronics textbook series.