What is least count of scale?
Least count of a measuring instrument is the smallest measurement that can be made accurately with the given measuring instrument. A metre scale normally has graduations at 1 mm (or 0.1 cm) spacing, as the smallest division on its scale.
What is least count of main scale and vernier scale?
A Vernier calliper scale can have a minimum count of 0.01 mm, while a micrometre can have a minimum count of 0.001 mm. The Least Count measuring instrument is determined mathematically by calculating the main scale reading by the cumulative number of divisions on the main scale.
What is vernier scale simple definition?
A small, movable auxiliary graduated scale attached parallel to a main graduated scale and calibrated to indicate fractional parts of the subdivisions of the larger scale. Vernier scales are used on certain precision instruments to increase accuracy in measurement.
What is least count explain with example?
Definition: The smallest value up to which an instrument can measure is called least count of the instrument. Example: least count of meter rule is up to 1 mm. least count of Vernier caliper is 0.01 cm.
What is meant by least count?
In the science of measurement, the least count of a measuring instrument is the smallest and accurate value in the measured quantity that can be resolved on the instrument’s scale. A stopwatch used to time a race might resolve down to a hundredth of a second, its least count.
How is least count measured?
Mathematically a measurement instrument Least Count is calculated by dividing main scale reading by the total number of divisions on the main scale. And if the instrument also has a Secondary scale. Then instrument LC is the ratio of main scale L.C. and number of divisions on the secondary scale.
What is meant by least count of a measuring instrument?
In the science of measurement, the least count of a measuring instrument is the smallest and accurate value in the measured quantity that can be resolved on the instrument’s scale. For example, a sundial may only have scale marks representing the hours of daylight; it would have a least count of one hour.
How do you calculate least count?
What do you know about least count?
The smallest value that can be measured by the measuring instrument is called its least count. Measured values are good only up to this value. The least count error is the error associated with the resolution of the instrument. A metre ruler may have graduations at 1 mm division scale spacing or interval.
Is Vernier constant and least count same?
Hint: The vernier constant (V.C.) of a vernier calipers is the ratio of the smallest division on the main scale to the number of divisions on the vernier scale. The vernier constant is the least count of the instrument.
What is the meaning of least count?
In the science of measurement, the least count of a measuring instrument is the smallest and accurate value in the measured quantity that can be resolved on the instrument’s scale.
What is the least count answer?
Define least count. Answer: The smallest value up to which an instrument can measure is called least count. For example least count of meter rule is up to 1 mm and least count of Vernier caliper is 0.01 cm.
How to calculate the least count of the vernier scale?
Calculate the least count of this vernier scale. Therefore, 1 VSD = 16/20 MSD = 0.8 mm The least count, LC = 1 MSD – 1 VSD = 1 – 0.8 = 0.2 mm The first step is to measure nothing through which we can check if the main scale and the vernier scale are aligned with each other.
What is the main scale of the vernier calliper?
It is a large scale that runs along the body of the vernier calliper. The reading on the main scale could be either in centimetres or millimetres depending on the usage. 1 mm is the lowest main scale division according to the SI units. The main scale is stationary.
How to calculate the least count of a scale?
Least Count of main scale = Value of 1 main scale division / Total main scale divisions Least Count Of Secondary Scale = Value of 1 secondary scale division / Total secondary scale divisions Least Count of an instrument = Least count of primary scale / Total secondary scale divisions
When did Pierre Vernier invent the vernier scale?
A measuring device that is used for the measurement of linear dimensions. It is also used for the measurement of diameters of round objects with the help of the measuring jaws. French mathematician Pierre Vernier invented the vernier scale in 1631.