A potentiometer is a three-terminal variable resistor, while a rheostat is a two-terminal variable resistor. Electricians usually use rheostats to adjust current and potentiometers to adjust voltage. Potentiometers work ... More »

A rheostat is a variable resistor that is used to alter the amount of voltage or current in a circuit, according to HowStuffWorks. Rheostats make possible functions of electronics such as light dimmers and volume dials. More »

Control the speed of an electric motor in a DC series circuit by placing a potentiometer or a rheostat between the motor and the power source. Adjusting the potentiometer or rheostat changes its resistance value and alte... More »

A potentiometer is a three-terminal resistor with a sliding or rotating contact (wiper) that forms an adjustable voltage divider. If only two terminals are used, it acts as a variable resistor or rheostat. More »

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A fixed resistor is an electrical component with a fixed resistance that can not be changed. Resistors are used to reduce current and voltage in an electrical circuit. Common resistors feature a series of color-coded str... More »

To wire a motor starting capacitor, connect the motor's positive terminal to the resistor and connect one of the resistor's terminals to the capacitor. Identify the manufacturer-defined start, run and common connections ... More »

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A resistor is an electrical device that resists current, and the difference between ohmic and non-ohmic resistors relates to how the resistor reacts to different types of current that pass through it. In an ohmic resisto... More »