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Originally Posted by redleader
Could be that you're giving it more power then you think. How are you measuring the power dissipated? I assume you're using the warm voltage drop squared over warm resistance? What kind of meter?
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Could be. I don't know all the math. My heater cartridge is rated at 40VDC 150watt and the ohm's is 10.7. I am using a DMM that shows 27.9V. The amps are not known as the amp setting is not working on the DMM. Theoretically the amps should be about 2.58 but maybe it is taking more power?