How to find least count in voltmeter and ammeter?

Question

Answer

Hiii

SimPly Follow These Steps..

= To get the least count of the 'main scale' , count the number of divisions on the main scale in one cm of it.

Divide 1 cm into that much number of divisions; the value obtained is the least count of the main scale in cm.

HoPe I'm Clear To U..

Answer

Least count of ammeter/ voltmeter = the highest reading of instrument/ total number of division

I hope it's helpful for us...

Answer

How to Find the Least Count in Voltmeter and Ammeter?

Introduction:
The least count is a measure of the smallest value that can be measured by an instrument. It is an important parameter to determine the accuracy and precision of a measuring device. In the case of voltmeters and ammeters, the least count represents the smallest change in voltage or current that can be detected. Finding the least count is essential to ensure accurate measurements using these instruments.

Steps to Find the Least Count:
1. Identify the scale: Examine the voltmeter or ammeter and identify the scale markings on the instrument. The scale indicates the range of measurements the instrument can make.

2. Count the divisions: Determine the number of divisions on the scale of the instrument. These divisions represent the steps in which the measurements can be made.

3. Calculate the range: Determine the difference between the maximum and minimum values on the instrument's scale. This represents the range of measurements that can be made.

4. Calculate the least count: Divide the range by the number of divisions to find the least count. This will give you the smallest value that can be measured by the instrument.

5. Consider the precision: Take into account the precision of the instrument. If the instrument has a vernier scale or a more precise reading method, the least count can be further refined.

6. Record the least count: Note down the calculated least count for future reference and to ensure accurate measurements.

Example:
Let's consider an ammeter with a scale range of 0-10 A and 20 divisions on the scale.

- The range of the ammeter is 10 A.
- The number of divisions on the scale is 20.
- The least count can be calculated as: Least count = Range / Number of divisions = 10 A / 20 = 0.5 A.

Therefore, the least count of this ammeter is 0.5 A, meaning that the smallest change in current that can be measured is 0.5 A.

Conclusion:
Finding the least count in voltmeters and ammeters is crucial to ensure accurate measurements. It involves identifying the scale, counting the divisions, calculating the range, and dividing it by the number of divisions to obtain the least count. Considering the precision of the instrument can further refine the least count. By understanding and utilizing the least count, accurate readings can be obtained while using voltmeters and ammeters.

Similar Class 10 Doubts

26. The current flowing through a resistor connected in an electrical circuit and the potential difference developed across its ends are shown in the given ammeter and voltmeter. Find the least count of the voltmeter and ammeter .What is the voltage and the current across the given resistor?

How can we find the least count of voltmeter or ammeter ?

While experimentally verifying Ohm’s Law a student observed that the pointer of the voltmeter coincide with 15th division when the voltmeter has a least count of 0.05 V. Find the observed reading of voltmeter.

How do we connect voltmeter and ammeter in a circuit ? What is likely to happen if the positions of these instruments are changed?

How we calculate the least count of voltmeter.

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