I've been studying amps with the intention to eventually mod and build an amp or two. I've been checking out electronic books from the library and reading a lot. I took an electronics class in college about 20 years ago and learned a lot from a great instructor and I am surprised how much I have forgotten since then as a lot of the basic stuff seemed very easy for me to construct and calculate as I remember it. Anyway, one thing I have discovered that I never knew before was that electricity actually flows from negative to positive. Now for the really dumb question: If we ground our amps to the chassis, why don't we get shocked when we touch the chassis? I would think electricity would be flowing through it.