[Stratoscope]

Here is an entertaining take on some related questions, going into the history of how our modern ground systems evolved:

http://amasci.com/amateur/whygnd.html

I would be interested in your comments about that article, thanks!

[yesenadam]

Bill Beaty's site has a load of great articles on electricity (and much else), linked to here:

http://amasci.com/elect/elefaq.html

Also misconceptions about electricity taught in school:

http://amasci.com/miscon/elect.html

Or pages on generally believed science myths:

http://amasci.com/miscon/miscon.html

How transistors really work:

http://amasci.com/amateur/transis.html

How capacitors really work:

http://amasci.com/emotor/cap1.html

There's loads more great stuff. He's a pleasure to read - a guy who thinks for himself, and experiments - tries things out for himself.