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Originally Posted by jaydee116
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?
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Those numbers are when the heater is at its test temperature right? If so, you've got 72.75w.
About the amps reading: you don't actually need it so long as you've got the resistance and voltage. When you say the amps setting is not working, you're breaking the circuit and wiring the meter up in series right? Voltage can be measured between two points, but current has to be measured through the meter.
Sorry if thats a dumb question, but I've seen experienced people stare at a DMM wondering why the current reading isn't working without realizing they've still got the probes in parallel with a componet and not in series with it.