This will help, but it's a pretty big spoiler: http://en.wikipedia.org/wiki/AC_power_plugs_and_sockets#Comp...

Google for types of power outlet. That one had me for ages as well.

Should you enter the whole names or only the first character of each? Or something else?

Just one character for each (That ends up being a common theme across quite a few of the chapters I've done so far at least)

isn't number 2 and number 6 both NEMA? The only difference is the grounding part

I'm not sure what NEMA is (I knew nothing at all about outlets before this), but I found they all corresponded to a different 1-character plug type.

This website rocked for this question because of all the images: http://electricaloutlet.org/

finally got it. i feel stupid lol

I think there are single-character names for each socket type under that standard? That's what Google results seem to suggest, at least.

So we base our answer off the socket types that hold the socket standard name under it?