The unit of sensitivity of an instrument is:

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ALP CBT 2 Electrician Official Paper (Held On: 23 Jan 2019 Shift 3)
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  1. ampere/sec
  2. volt/ohm
  3. volt-amp
  4. ohm/volt 

Answer (Detailed Solution Below)

Option 4 : ohm/volt 
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Detailed Solution

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Sensitivity: 

  • It is defined as the ratio of the changes in the output of an instrument to a change in the value of the quantity being measured.
  • It denotes the smallest change in the measured variable to which the instrument responds.

\(Sensitivity\left( S \right) = \frac{{change{\rm{ }}in{\rm{ }}output}}{{unit{\rm{ }}change{\rm{ }}in{\rm{ }}input}} = \frac{{{\rm{\Delta }}output}}{{{\rm{\Delta input}}}}\)

  • The sensitivity of an instrument is determined by dividing the sum of the resistance of the meter (Rm) and the series resistance (Rs), by the full-scale reading in volts.

Mathematically, sensitivity is expressed as:

\(Sensitivity=\frac{R_m+R_s}{E}\)

Expressing the above expression in units, we get:

\(Sensitivity=\frac{Ohms}{Volt}\)

Unit of instrument sensitivity is expressed in Ohm/Volt

Important Points

Sensitivity is also expressed as:

\(Sensitivity=\frac{1}{ampere}\)

So, sensitivity is said to be equal to the reciprocal of the full-scale deflection current.

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