I did a course in electrical engineering, where I feel that it was a giant babysitting exercise for 4 years. Luckily, scholarships allowed me to not pay for what I didn't learn.
I've been mucking about with computer hardware for about 1/2 my life. Starting with the time I ran a screwdriver down a ISA slot in disgust with a tandy1000 (286) while it was on, as it wouldn't recognise an ISA joystick card. Just testing the "Electrical Isolation" that the manual declared was one of the features of the Tandy series PC's.
A quick flick of power switch & a wet blanket later was all that was required.
Needless to say, after the smoke had cleared, I vowed never to (destructive) test vendors claims again