Fluke FTW. All that electrical stuff beyond Ohm's law is still magic to me.
I've designed and built systems to do different things (years ago in labs). I can still do that because I occasionally have to for work. It's the simple 12V DC s*** that throws me off now and then... because on paper, it really is simple. All of the equations are basic calculus 1 at the most. I just do everything on paper A LOT more than in reality.