Potentiometers, rheostats and trimmers are three-terminal resistors that are used to measure or divide voltages, and to protect or control circuits

Voltage dividers and voltage references provide highly-accurate reference voltages for calibration and testing purposes.

Current sensing resistors convert the current flowing through it to a voltage drop. Monitoring or measuring this voltage drop allows the current through the resistor to be measured. Applications for current sensing resistors include power supplies, receptacles, and battery packs. 

DC motors are most commonly used in variable speed and torque applications. They include brushless and gear motors, as well as servomotors.

Resistance standards and decade boxes provide a highly accurate standard value of resistance for calibration and testing.

Resistors and potentiometers are passive electronic components that oppose the flow of either alternating current (AC) or direct current (DC).