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Old 02-05-2009, 07:48 PM   #51
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Just to add my 5 cents; that equation should be P=E^2/R. An R is roughly (but not exactly) constant; all metals increase their resistance with temperature; although the effect is small at low temperatures (less than 2% for nichrome at 100 Centigrade).

To sum up, if E (voltage) is decreased by a factor K, then the power is decreased as K^2; (ignoring the change in resistance).

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