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What is "voltmeter"

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voltmeter
Longman Dictionary of Contemporary English
voltmeter
noun
EXAMPLES FROM CORPUS
▪ Voltmeter readings around IC2 should produce the following results, assuming that the negative lead of the voltmeter is connected to 0V.
▪ Calibration Select one amplifier for calibration and connect a voltmeter to the test point at the first stage output.
▪ Ideally, any alternating voltmeter should possess infinite impedance and any a.c. meter negligible impedance.
▪ Strictly speaking, the voltmeter should give true r.m.s. measurement.
▪ The r.m.s. current,, may be found by measuring the r.m.s. potential difference with a suitable voltmeter from which.
▪ This will change the voltage at any porthole whose current line is affected, and the appropriate voltmeter will register the fact.
The Collaborative International Dictionary
Voltmeter

Voltmeter \Volt"me`ter\, n. [2d volt + -meter.] (elec.) An instrument for measuring in volts the differences of potential between different points of an electrical circuit.

Douglas Harper's Etymology Dictionary
voltmeter

instrument for measuring the difference of potentials in volts, 1882, from volt + meter (n.3).

Wiktionary
voltmeter

alt. An instrument for measuring electric potential in volts. n. An instrument for measuring electric potential in volts.

WordNet
voltmeter

n. meter that measures the potential difference between two points

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Wikipedia
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.

Voltmeters are made in a wide range of styles. Instruments permanently mounted in a panel are used to monitor generators or other fixed apparatus. Portable instruments, usually equipped to also measure current and resistance in the form of a multimeter, are standard test instruments used in electrical and electronics work. Any measurement that can be converted to a voltage can be displayed on a meter that is suitably calibrated; for example, pressure, temperature, flow or level in a chemical process plant.

General purpose analog voltmeters may have an accuracy of a few percent of full scale, and are used with voltages from a fraction of a volt to several thousand volts. Digital meters can be made with high accuracy, typically better than 1%. Specially calibrated test instruments have higher accuracies, with laboratory instruments capable of measuring to accuracies of a few parts per million. Meters using amplifiers can measure tiny voltages of microvolts or less.

Part of the problem of making an accurate voltmeter is that of calibration to check its accuracy. In laboratories, the Weston Cell is used as a standard voltage for precision work. Precision voltage references are available based on electronic circuits.

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Usage examples of "voltmeter".

Now instrument-needles were moving all over the panel: oil pressure, vacuum gauge, ammeter, voltmeter, heading indicator, artificial horizon, navigation indicators.

The tiny voltmeters at each porthole all register the voltage as 'normal' for their porthole.

So in theory a computer, by comparing the pattern of voltages registered by the voltmeters at all the portholes, could calculate the pattern of obstacles around the fish.

Behind the workman scurried assistants, dashing about carrying stethoscopes and voltmeters and giant wrenches over a great scaffolding.