Well, if you change your mind back to the 2330 course then I'd recommend the JTL books as they're specifically designed as an accompaniment for the course . . . and it just so happens - I've got a couple going spare if you need, for a decent price of course
Nah, seriously, the JTL are a reasonably basic introduction, but missing a fair bit of stuff - and to the layman they're still not gonna be basic enough to be understood easily.
Really, there isn't a way of getting a completely basic breakdown about electrics, because fundamentally quite a lot of the principles are quite complex. To be honest, I'd think you'd be better of getting something a bit more in depth, and just reading up on it and trying to understand properly.
Scaddon is worth a try, as is the Whitfield book, which looks like this:
