An ammeter has a range of $(0 - 3) a m p e r e s$ and there are $30 d i v i s i o n s$ on its scale. Calculate the least count of the ammeter.

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Solution

Step 1: Given
Range of ammeter: $R_{A} = 3 A$
Number of divisions: $N = 30$
Step 2: Formula Used
$L e a s t C o u n t = \frac{R a n g e}{N u m b e r o f d i v i s i o n s}$
Step 3: Calculate the range of ammeter using the formula
$L e a s t C o u n t = \frac{N}{R_{A}} = \frac{3 A}{30} = \frac{1}{10} A = 0.1 A$
Hence, the least count of ammeter is $0.1 A$ .

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