potentiometer

(noun)

an instrument that measures a voltage by opposing it with a precise fraction of a known voltage, and without drawing current from the unknown source.

Examples of potentiometer in the following topics:

Null Measurements
- A potentiometer is a null measurement device for measuring potentials (voltages).
- The potentiometer is a null measurement device.
Electric Potential Energy and Potential Difference
- These include the voltmeter, the potentiometer, and the oscilloscope.