Concept:Instruments are classified by their operation into indicating, recording, and integrating types.
A voltmeter shows the instantaneous value of voltage on a scale with a pointer.
Explanation:Indicating instruments display the value of the quantity being measured at the moment of measurement.
They use a pointer moving over a calibrated scale to show the reading.
Examples include ammeter, voltmeter, and wattmeter.
Recording instruments continuously note variations of a quantity over time on a chart.
Integrating instruments total the quantity consumed over a period, like an energy meter.
A voltmeter does not record or integrate; it simply indicates the current voltage.
Therefore, a voltmeter belongs to the indicating category.
Answer:Voltmeter is an indicating instrument.
Correct option: C. Indicating.