Least count of an ammeter
A 0 to 3 A ammeter with 30 divisions reads in steps of 0.1 A.
Least count
Least count. The smallest value an instrument can read. It is the smallest error you can make in one reading. Least count = range / number of divisions.
Least count
0.1A
3 A / 30 = 0.1 A
Least count = range / number of divisions.
Least count = range / number of divisions
An ammeter is used for electric current. The working for the textbook numbers is 3 A / 30 = 0.1 A.
Other instruments
Ammeter: quick answers
What is the least count of an ammeter?
A 0 to 3 A ammeter with 30 divisions reads in steps of 0.1 A. Least count = range / number of divisions.
How do I find the least count of my ammeter?
Least count = range / number of divisions. For the instrument in front of you, read the scale and use your own numbers in the tool above.
Why does the least count matter?
The least count is the smallest reading you can make, so it sets the smallest error in a single measurement. Ammeter measures electric current.