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rheostat noun [C]. âº a âdevice used to âcontrol and âchange the âflow of âelectric âcurrent through a âmachine such as an âelectric âlight. (Definition of rheostat from the Cambridge Advanced Learnerâs Dictionary & Thesaurus Â© Cambridge University Press).
Answer Wiki. A rheostat is nothing more than a variable resistor. Traditionally, a rheostat differs from a potentiometer in having only two terminals, one connected to the wiper and one to an end of the resistive element, but since a potentiometer (with three terminals) can also be used as a rheostat, that distinction is often overlooked.