A rheostat is merely a potentiometer with the third terminal left off, or with the third terminal present, but not used in the hookup. It's used in a circuit as a series resistor (instead of a voltage ...
I picked up a couple of 25 ohm rheostats from radio shack to make a fan bus. I hooked them up and they seem to be working fine. But they get extremely hot, is this something I should be worried about?
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