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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.
An ideal voltmeter has two terminals and senses the voltage between the terminals where they may be connected to a circuit. Ideally the voltmeter has infinite resistance. It is polarized and indicates polarity as well as the magnitude of the voltage. An ideal ammeter is a two terminal device, also polarized. It is connected in series with circuit elements to measure the sign and magnitude of the current flowing through that component. The circuit has to be opened to insert the ammeter to measure current flow. The ideal ammeter has no resistance to flow.