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Demonstration voltmeter. A voltmeter is an instrument used for measuring electrical potential difference between two points in an electric circuit. Analog voltmeters move a pointer across a scale in proportion to the voltage of the circuit; digital voltmeters give a numerical display of voltage by use of an analog to digital converter. A voltmeter in a circuit diagram is represented by the letter V in a circle.
A voltmeter is used to measure potentials as shown in Figure 1. The voltmeter has two clips that are colored red and black. When the red clip is connected to the anode and the black clip is connected to the cathode, a positive voltage is detected as shown in Figure 1. If the clips are backwards, a negative voltage is detected. In order to practice using the voltmeter, you can measure the potential of a closed battery. Turn on the meter and if it is not set to voltage push the + button once or twice. 1) Measure the potential difference of a AA (1.5 V) battery.