Noun
An instrument for measuring in volts the differences of potential between different points of an electrical circuit.
Source: Webster's dictionaryA digital voltmeter (DVM) measures an unknown input voltage by converting the voltage to a digital value and then displays the voltage in numeric form. Source: Internet
A meter can be calibrated as a DC voltmeter if the resistance of the coil is known by calculating the voltage required to generate a full scale current. Source: Internet
A once-popular form of this instrument used a vacuum tube in the amplifier circuit and so was called the vacuum tube voltmeter, or VTVM. Source: Internet
A voltmeter in a circuit diagram is represented by the letter V in a circle. Source: Internet
A voltmeter can be used to measure the voltage (or potential difference) between two points in a system; often a common reference potential such as the ground of the system is used as one of the points. Source: Internet
A voltmeter is capable of measuring the change of electrical potential between the anode and the cathode. Source: Internet