Calculate the sensitivity of a 0-1 mA meter.

This question was previously asked in
HPCL Engineer Electrical 01 Nov 2022 Official Paper
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  1. Ω/V
  2. 100 Ω/V
  3. 10 Ω/V
  4. 1 kΩ/V

Answer (Detailed Solution Below)

Option 4 : 1 kΩ/V
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Detailed Solution

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The correct answer is option 4):(1 kΩ/V)

Concept:

Concept:

Sensitivity of voltmeter is commonly expressed in ohms per volt Sensitivity of voltmeter is the ratio of resistance of the instrument (Rm) to full scale reading of the same.

Sensitivity (S) of a voltmeter is the reciprocal of full-scale deflection current (Ifsd)

Total internal resistance of a voltmeter is given by

R\(Vfsd\over Ifsd\)

Rm = full scale range of voltmeter × sensitivity

Rm = Vfsd × S

Calculation:

Given, Ifsd = 1 mA

Sensitivity (S) = \(1\over I_{fsd }\) = \(1\over 1 \times 10^{-3}\)

 = 1000 Ω/V

1 kΩ/V

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