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Power (IIRC) is I squared R, or E times I. So I am guessing that a DC motor is designed for an operating rpm range and load. Too much load and the motor stalls and sucks max amps. If enough amps available for a long enough time, then motor melts. Otherwise motor just stalls, and gets hot and runs battery down. Otherwise, load within design spec, motor can handle load and just sucks enough amps to do the job asked of it.
I think that this is correct. I am open to be corrected.
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