Ammeter 'A' has 5 divisions between the marks 0 and 1A while ammeter 'B' has 10 divisions between the marks 0 and 1 A. Which will give more precise reading ?
Answers
Given info : Ammeter 'A' has 5 divisions between the marks 0 and 1 A while ammeter 'B' has 10 divisions between the marks 0 and 1 A.
To find : which will give more precise reading ?
solution : we know, The precision of an instrument is inversely proportional to least count of the instrument.
means, if least count is lower than others, it will be more precise.
least count of ammeter A,
L.C = smallest main scale reading/no of divisions
= 1/5 = 0.2 A
similarly, least count of ammeter B,
L.C = 1/10 = 0.1 A
you see, leat of Ammeter B < least count of ammeter A
so, The ammeter B will give more reading than the ammeter A.
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Explanation:
Given info : Ammeter 'A' has 5 divisions
between the marks 0 and 1 A while ammeter 'B' has 10 divisions between the marks 0 and 1 A.
To find which will give more precise reading ?
solution : we know, The precision of an instrument is inversely proportional to least count of the instrument.
means, if least count is lower than others, it will be more precise.
least count of ammeter A,
L.C = smallest main scale reading/no of divisions
= 1/5 = 0.2 A
similarly, least count of ammeter B,
L.C=1/10 = 0.1 A
you see, leat of Ammeter B < least count of ammeter A
so, The ammeter B will give more reading than
the ammeter A.
also read similar questions : In a given ammeter, a student sees that needle indicates 17 divisions in ammeter while performing an experiment to verif...
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