- Least count of a measuring instrument is the least value of physical quantity that can be measured accurately using the instrument.
- For example,
- Take a spring balance whose range is 0-25kg.
- Measurement=1kg.
- Number of divisions=10.
- Least count=1/10 =0.1kg or 100g.
How do you calculate spring balance?
It is calculated by dividing the change of force by the change in spring extension . For the example in the figure below, this is calculated by dividing 5 newtons by 50 mm, which gives a spring constant for this Newton spring balance of 0.1 newtons per mm extension.
How do you calculate least count of spring balance?
The least count can be determined by measuring a 1kg object and by counting the number of divisions that the needle is pointing upon when the weight is applied, which will be equal to 10 divisions. So we get the least count as 0.1kg per division or 100g per division.
What is the formula for least count?
Least count of a Vernier scale is calculated using the following formula, Least count = Smallest reading on main scaleNumber of divisions on Vernier scale=1mm10 = This is the least count for Vernier Callipers. Hence, the least count for Vernier Callipers is 0.1mm.
What is the least count of the spring balance shown below?
Therefore, the minimum value it can measure is one hundred grams, which can be measured as follows: Measurement = 1 kg Total Number of divisions = 10 Least count= (1/10) = 0.1kg (or 100g ) Hence 100g is the least count of this instrument.
What is range and least count?
The least count is related to the precision of an instrument. Basically, An Ammeter has a range of 0−3A and there 30 divisions on the ammeter. Range is basically the difference between maximum value to the minimum value. So the range of ammeter =3-0= 3 A.
What is the least count of balance?
1% = 0.01 mg least count balance. It shows that if you have a balance with least count 0.01 mg, you can weigh minimum 10 mg sample on it. Other weights can be calculated accordingly. Update: Simply you can calculate the minimum limit by multiplying least count by 1000.
What is measured by a spring balance?
A spring balance measures the weight of an object by opposing the force of gravity acting with the force of an extended spring.
What is spring balance diagram?
Spring balance is a device used for measuring force on the object . It has a spring attached to a hook . When we attach the hook to the weight, the spring extends and the pointer shows us the Force in Newtons.
What is the range of a spring balance?
Spring balances with weight range from 5 up to 1000 grams have a gripping device for the loading while the ones with weight range from 2,5 up to 50 kg have a load hook. Mechanical spring balances are unique for demonstrations.
What is least count give example?
The least count of an instrument is inversely proportional to the precision of the instrument. For example, a sundial may only have scale marks representing the hours of daylight ; it would have a least count of one hour. A stopwatch used to time a race might resolve down to a hundredth of a second, its least count.
What is height gauge least count?
The graduated scale has least count of 0.02 mm like Vernier Caliper has. And the way of taking a reading of measurement in Vernier Height Gauge is same as in Vernier gauge.
What is LC of vernier caliper?
The LC of vernier calliper is the difference between one smallest main scale reading and one smallest vernier scale reading of 0.1 mm 0r 0.01 cm. ... 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 the least count of chemical balance?
The least count is 0.0002g . An electronic balance is one that uses an electromagnet to balance the object to be weighed on a single pan. A chemical can be conveniently weighed on a piece of weighing paper without having to determine the weight of the paper.
What is the least count of stop watch?
Furthermore, the least count is the most accurate and smallest value measured by the instrument. The smallest yet the most accurate measure we can make is 0.01 second in the digital stopwatch. Therefore the least count of a digital stopwatch is 0.01 second.
What is zero error in the spring balance?
The zero error in a spring balance can be found by suspending it freely . Hold the spring balance in your hand and do not place any weights on it. ... If it is zero, then there is no zero error. If the pointer is slightly down (say 1) then zero error is -1.
