Bottlehead Forum

Linear / non-linear

72.222.236.36

In Reply to: RE: OT. Ohms Law posted by joegibney on April 12, 2008 at 13:39:22

Assuming the heater's resistance is linear (it isn't)

....Power = 1500W * (208V/220V)^2 = 1341 watts.

W = V^2/R

or the heater's R = V^2/W

R = 220^2/1500W = 32.27 ohm

....W = 208V^2/32.27ohm = 1341 watts.

The heater's resistance isn't linear, so as it cools off, the ohms will drop a bit meaning it will be drawing between 1341 and 1500W.

Play safe and play longer! Don't be an "OUCH!" casualty.
Unplug it, discharge it and measure it (twice) before you touch it.
. . .Oh!. . .Remember: Modifying things voids their warranty.

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