The hardest job I even had to be was a stationary engineer as I had to take and pass a course for industrial electric service (440V)
Betweens Ohms law IRE etc and Columbs and micro Henries and circular mill of the wire and single pole single throw switch and DTDP and three way and a whetstone bridge ( full wave rectifer) I gained a whole new respect for sparky's and the National electrical code I have a a lot of respect for electricians VERY complex field you chose.
I think the only reason I was able to pass the course was my plumbing back ground as I changed the switches to valves and instead of hot / neutral and gound I made it hot /cold and return in my mind
A diode I made into a check valve and resistance became friction loss
I thought plumbing had lots of math formulas and at least with plumbing you can see the water without a meter( Simpson 260) I would never have been able to do the complex testing of AC equipment.
Very techinical profession my hat off to you gentleman