Question

In a given ammeter, a student sees that needle indicates 17 divisions in ammeter while performing an experiment to verify Ohm’s law. If ammeter has 10 divisions between 0 and 0.5A, then what is the value corresponding to 17 divisions?

Answer 1

Ammeter has 10 divisions between 0 to 0.5A
So, reading of one division { it is also known as least count } = {gap between higher value and lower value }/number of divisions
= (0.5A - 0)/10 = 0.05A

∴ reading of one division = 0.05A
∴ reading of 17 division = 17 × reading of one division = 17 × 0.05 = 0.85A

Hence, the value corresponding to 17 divisions= 0.85A

Answer 2

An ammeter has 10 divisions between 0 to 0.5 A.

So,

1 Division = 0.5 A / 10 = 1/20

17 divisions = 17/20 = 0.85 A