Question

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what is voltmeter? ​

Answer 1

Answer:

an instrument for measuring voltage

Answer 2

Answer:

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). ... The potentiometer operates by comparing the voltage to be measured with known voltage; it is used to measure very low voltages.

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