Given two ammeters ‘a’ and ‘b’, where ‘a’ has a sensitivity of 20

Given two ammeters ‘a’ and ‘b’, where ‘a’ has a sensitivity of 20
| Given two ammeters ‘a’ and ‘b’, where ‘a’ has a sensitivity of 20 kΩ per volt and ‘b’ has a full-scale deflection current of 1 mA. Which ammeter is more sensitive?

A. a

B. b

C. both a and b are equally sensitive 

D. None of the above 

Please scroll down to see the correct answer and solution guide.

Right Answer is: A

SOLUTION

Concept:

In ammeters, sensitivity is defined as:

\(S = \frac{1}{{{I_{fsd}}}}\)

Ifsd is the full-scale deflection in Amp and is expressed in ohm/volt

Calculation:

Given the sensitivity of 'a' = 20 kΩ per volt

For the given full-scale deflection current of 1 mA for 'b', the sensitivity will be:

\(S = \frac{1}{{{I_{fsd}}}}=\frac{1}{1m}\)

S = 1 kΩ per Volt

On comparing, we conclude that the sensitivity of 'a' is greater than the sensitivity of 'b'.

Related Questions