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A voltmeter is a device used to measure the voltage or potential difference between two points in an electrical circuit.
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Multimeter: A multimeter is a versatile device that combines the functions of multiple measuring instruments, including a voltmeter, ammeter, and ohmmeter.
Voltage refers to the electric potential difference between two points in an electrical circuit.
Circuit: A circuit is a closed loop through which electric current flows. It consists of various components connected by conductive wires.