Voltmeter sensitivity is defined as

Voltmeter sensitivity is defined as

Right Answer is:

Reciprocal of the full-scale deflection current


A voltmeter is an instrument used for measuring the electrical potential difference between two points in an electric circuit.

Sensitivity: The sensitivity of an instrument indicates the capacity of the instrument to respond truly to the change in the output, corresponding to the change in the input.

The sensitivity of a voltmeter is given in ohms per volt. It is determined by dividing the sum of the resistance of the meter (Rm) plus the series resistance (Rs), by the full-scale reading in volts. In equation form, sensitivity is expressed as follows:

Sensitivity, S = (Rm + Rs) ⁄ Vin

This is the same as saying that the sensitivity is equal to the reciprocal of the full-scale deflection current. In equation form, this is expressed as follows:

S = Ohm/Volt = 1/Amp = 1/Ifsd

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