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*Rheostat:Two terminal variable resistor used to control current. Although definitions vary, in simplistic terms a potentiometer and a rheostat are both synonyms for variable resistor. However, the rheostat is often clarified as being a variable resistor with only two terminals, and designed to handle higher current than a typical three terminal potentiometer. A potentiometer can be connected as a rheostat by leaving one of the terminals unconnected.