Rotary Potentiometers, Rheostats are in stock at Tenco Electronics. A rheostat is a variable resistor which is used to control current. They are able to vary the resistance in a circuit without interruption. The construction is very similar to the construction of a potentiometers. It uses only two connections, even when 3 terminals (as in a potentiometer) are present.Tenco offers inventory, pricing, & datasheets for Rotary Potentiometers, Rheostats. To know more, please view our large section of Rotary Potentiometers, Rheostats below.