Posted by MarkB_MI on February 19, 2022 at 18:00:34 from (174.211.41.189):
In Reply to: Re: Block heaters posted by BarnyardEngineering on February 19, 2022 at 16:33:23:
> Maybe it's inductive loads only but on AC as the voltage goes down current goes UP. I've observed this with the rooftop AC on my camper as I tried to run it on an inadequate extension cord. Voltage got down to 92 and then the breaker tripped.
That's true of induction motors, which want to run at a certain speed and will draw whatever current is necessary to generate sufficient torque to run at that speed. In a low voltage situation, the motor will draw more current than normal, which in turn results in even greater voltage drop. At some point the motor stalls, overheats or trips a breaker.
It's not true, however, of simple resistive loads like heaters. Their behavior is governed by Ohm's Law, which states that as voltage drops, current drops as well.
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