Now that my boys are of suitable age I'm teaching them all I know about electricity. It's not that much, I'm still learning, but we got off to a good start and now we're exploring things. I built an LED system with an Arduino and bunch of buttons and we'll take it from there. Fun!
@voidzero I suggest giving them an intro to electromagnetism by hand-winding copper wire on a paper towel tube. I'll try and dig up our flapper creation (which is basically an old style bell alarm).