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Demonstration 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.
You add a large series resistor to make it into a voltmeter. You add a small shunt (parallel) resistor to make it into an ammeter. Example. If the galvo full scale is 20mV and 20uA, ie, 1k resistance.To make the galvo into a 1 amp FS ammeter, a shunt resistor of: Req = 20mV/1amp = 20m.This is much smaller than the 1k, so a shunt resistor of 20m would work.rom Wikipedia. Galvanometer. A galvanometer is a type of ammeter: an instrument for detecting and measuring electric current. It is an analog electromechanical transducer that produces a rotary deflection of some type of pointer in response to electric current flowing through its coil.