What is least count of a instrument.
The smallest value that can be measured by the measuring instrument.
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The least count of an instrument refers to the smallest measurement that can be made with that instrument. It indicates the precision or accuracy of the instrument. To determine the least count of an instrument, you need to know the different types of scales or divisions present on the instrument and their corresponding values.
To calculate the least count, you typically follow these steps:
1. Identify the main scale or division on the instrument: This is the largest scale used to measure the quantity you are interested in. For example, in a ruler, the main scale could be the centimeter scale.
2. Find the total number of divisions on the main scale: Count the total number of equally spaced divisions on the main scale. In a ruler, this would be the number of centimeter markings.
3. Determine the smallest subdivision on the instrument: Identify the smallest division on the main scale, which could be a smaller line or marking between the larger divisions. This is the smallest unit directly indicated on the instrument.
4. Calculate the least count: Divide the value of the smallest subdivision on the main scale by the total number of divisions. This will give you the least count of the instrument.
For example, if a ruler has a main scale of centimeters (divided into 10 divisions) and the smallest subdivision is millimeters, the least count would be 1 millimeter/10 divisions = 0.1 millimeters.
By following these steps and understanding the scales and divisions on the instrument, you can determine the least count, helping you understand the precision and accuracy of the measurements made with that particular instrument.