Voltmeter sensitivity is defined as
Right Answer is:
Reciprocal of the full-scale deflection current
SOLUTION
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
