Question

How to find the Least Count and Range of Voltmeter and Ammeter?​

Answer 1

Answer:

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

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

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Answer 2

Answer:

The ammeter has to be set up in series and voltmeter in parallel. Take down the readings and get the graph between V and I. See the slope it will give you the resistance of the wire! The ranges of voltmeter and ammeter are already mentioned on them thus eliminating the need to calculate them.

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