what are ampliers?
A voltmeter is an instrument used for measuring electrical potential difference between two points in an electric circuit.
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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.
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 accuracies of a few parts per million.
Meters using amplifiers can measure tiny voltages of microvolts or less.
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