Final answer:
A voltmeter measures electrical potential difference in a circuit, utilizing Ohm's law. Multimeters can serve as both ammeters and voltmeters.
Explanation:
Voltmeter is the instrument used to measure the difference in electrical potential between two points in an electric circuit. It operates based on Ohm's law and can be used to measure various quantities like voltage, pressure, and temperature. A multimeter can function as both an ammeter and a voltmeter, providing versatile measurement capabilities in the lab.
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