"Morex Support" wrote in message
able.rogers.com...
Fatal Error.
The heating element is resistive. 120V 2KW element is approx 7 ohms.
Reduce
voltage to 24 v and current draw drops to 3.5 amps. Power is not a
constant.


I am sure that Larry wasn't suggesting that a 120 volt heating element be
used at 12 volts. What he was suggesting is that IF a 24 volt equivalent
device could be found, then it would draw 83 amps.

Oh, and by the way, your example is way off also. In most cases, heating
elements have a dramatic increase in resistance as they heat up. The element
in question may have a resistance of 7 ohms when it is dissipating 2KW, but
if you drop the voltage the resistance will drop also.

This resistance change is even more dramatic on a light bulb. Take a low
wattage light bulb and measure the resistance when it is cold and you may be
surprised! This is why cutting the voltage in half to incandescent lights
does NOT cut the current in half!

Rod McInnis