Posted by ChrisB on January 16, 2010 at 15:52:56 from (97.95.187.61):
In Reply to: Electricity use ????? posted by Leland2 on January 16, 2010 at 10:48:22:
jdemaris said: (quoted from post at 19:08:20 01/16/10) Nope. Amp draw in total is just the same. A 120 VAC circuit runs all the power through one line. An 240 volt circuit uses two lines, with half the power on each line. Total amps is exactly the same, either way.
Please do not confuse Dave any more then he needs. Where Dave lives 240v is on one hot, not two as in the USA and you imply here.
Dave,
If you are using a transformer to reduce your voltage you need to calculate it's efficiency into your cost savings. If you are using one of the common 240v-120v gray ones, you can count on about 85% efficiency (the other 15% is the warm transformer you feel). In that case a 10 watt bulb will actually use 11.5 watts if you are using a current reducing transformer.
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