A voltmeter is a device that measures the difference in electrical potential between two locations in an electric circuit.
Voltmeters are used to measure voltages in both direct and alternating currents.
A voltmeter's scale is measured in millivolts, volts, or kilovolts.
Analog voltmeters move a pointer around a scale in proportion to the circuit's voltage; digital voltmeters utilize an analog to digital converter to show voltage numerically.
