has a lot to do with the size of the wire being used. higher voltages can carry a load over greater distances using smaller gauge wire. when you get to your location you then use a step down xformer to get the desired amp and voltage service you need. when voltages are lower larger gauge conductors are needed.
One reason is that the loss in the lines is I time R squared. So, with a higher voltage, the current is lower for the same power transmission.
R= resistance in ohms I = current in amperes
Al
In response to what Al posted in news:no.spam- snipped-for-privacy@news.verizon.net:
Oh dear. Power = I x I x R!
OK, I got the oil gag, but this one escapes me. Can you 'splain?
Thnaks, Rich
I think he means ferro-resonant ones are self-regulating, hence automatic transmission fluid.
-- john
On Fri, 7 Jul 2006 18:36:44 -0500, Abstract Dissonance wrote in Msg.
Wrong on two counts. Conductors are always full of electrons -- independently of the current through them, and liquid water doesn't appreciately change its volume under preesure.
robert
Ah, got it.
Thanks! Rich
incidently, so are insulators, well except maybe hard vacuum and plasmas
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