If the resistance is known, the galvanometer can be used to measure voltage by utilizing Ohm's law. The full-scale voltage is found by multiplying the full-scale current by the meter resistance.

Do voltmeters measure voltage?

voltmeter, instrument that measures voltages of either direct or alternating electric current on a scale usually graduated in volts, millivolts (0.001 volt), or kilovolts (1,000 volts). Many voltmeters are digital, giving readings as numerical displays.

How is galvanometer used as a voltage measuring device?

Voltmeter is always connected in parallel to a circuit. Since Galvanometer is a very sensitive instrument, therefore it can not measure high potential difference. In order to convert a Galvanometer into voltmeter, a very high resistance known as "series resistance" is connected in series with the galvanometer....