On Thu, 24 Nov 2005 06:30:20 -0800, Don Bruder
wrote:

If not, how about an explanatin why,

Far too involved to try to answer in a newsgroup posting, particularly
since we have no idea what level of knowledge you have about the basics
behind how motors work. Suggest you try google - "Reversing AC motors"
seems like a good starting place

Nevermind how an AC motor works. Harold got it right. The
polarity of AC (alternating current) reverses 120 times a second,
goes thru 60 complete cycles per second. The motor has no way of
"knowing" which way the plug is inserted -- and it doesn't matter,
since it gets AC either way.