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The smallest value that can be measured is called Least Count .
In Ammeter and Voltmeter, the smallest value that can be measured will be least count.
Let's do this by some examples
Find Least count of Ammeter and Voltmeter given below
Here,
| Voltmeter | Ammeter |
|
For Voltmeter, We see that 5 Division is equal to 2 Volts
So, Least Count = 2/5 = 0.4 V |
For Ammeter, We see that 5 Division is equal to 10 Amperes
So, Least Count = 10/5 = 2 A |
So, Least Count of Voltmeter is 0.4 V and Least count for Ammeter is 2A
Find Least count of Ammeter and Voltmeter given below
| Voltmeter | Ammeter |
|
For Voltmeter, We see that 10 Divisions is equal to 5 Volts
So, Least Count = 5/10 = 0.5 V |
For Ammeter, We see that 10 Divisions is equal to 100 Milli Amperes
So, Least Count = 100/10 mA = 10 mA = 10 × 10 -3 A = 10 -2 A = 0.01 A |
So, Least Count of Voltmeter is 0.5 V and Least count for Ammeter is 0.01 A
Find Least count of Ammeter and Voltmeter given below
| Ammeter | Voltmeter |
|
For Ammeter, We see that 10 Divisions is equal to 0.2 Amperes
Least Count = 0.2/10 = 0.02 A |
For Voltmeter, We see that 10 Division is equal to 1 Volt
So, Least Count = 1/10 = 0.1 V |
So, Least Count of Voltmeter is 0.4 V and Least count for Ammeter is 0.02 A
An ammeter has a range of 0-3 ampere and there are 30 divisions on its scales. What is its least count?
This means that
In Ammeter
30 Division is 3 A
So,
Least Count = 3/30
= 1/10
= 0.1 A
So, Least Count of Ammeter is 0.1 A
