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Multiplication & Division of Errors

Least count o...

Question

Least count of ammeter and voltmeter are?

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Solution

A.the least count of ammeter is $\frac{3}{30} = \frac{1}{10} = 0.1 A$
b.the least count of voltmeter is $\frac{0.5}{20} = 0.02 V .$

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Q. The following apparatus is available in the school laboratory:

Battery	:	4.5 V
Rheostat	:	Varies battery voltage from 0 to 4.5 V
Resistors	:	1 Ω and 2 Ω
Ammeters	:	A₁ of range 0 to 1 A; Least count 0.05 A
	:	A₂ of range 0 to 3 A; Least count 0.1 A
Voltmeters	:	V₁ of range 0 to 5 V; Least count 0.1 V
	:	V₂ of range 0 to 10 V; Least count 0.5 V

The best combination of ammeter and voltmeter for finding the resultant resistance of the two given resistors connected in series would be:
(1) ammeter A₁ and voltmeter V₁
(2) ammeter A₁ and voltmeter V₁
(3) ammeter A₂ and voltmeter V₁
(4) ammeter A₂ and voltmeter V₂

Q. The science laboratory in a school has the following apparatus available in it:

Battery	:	6 V
Rheostat	:	Varies battery voltage from 0 to 6 V
Resistors	:	3 Ω and 6 Ω
Ammeters	:	A₁ of range 0 to 5 A; Least count 0.25 A
	:	A₂ of range 0 to 3 A; Least count 0.1 A
Voltmeters	:	V₁ of range 0 to 10 V; Least count 0.5 V
	:	V₂ of range 0 to 5 V; Least count 0.1 V

For the experiment to determine the equivalent resistance of the two given resistors connected in parallel, the best combination would be:
(1) ammeter A₁ and voltmeter V₂
(2) ammeter A₂ and voltmeter V₁
(3) ammeter A₁ and voltmeter V₁
(4) ammeter A₂ and voltmeter V₂

Q. You are given four ammeters A, B, C and D having the least counts mentioned below:
(a) Ammeter A with least count 0.25 A
(b) Ammeter B with least count 0.5 A
(c) Ammeter C with least count 0.05 A
(d) Ammeter D with least count 0.1 A

Which of the ammeters would you prefer for doing an experiment to determine the equivalent resistance of two resistance most accurately, when connected in parallel?
(1) A
(2) B
(3) C
(4) D

Q. In figure the voltmeter and ammeter shown are ideal. Then voltmeter and ammeter readings, respectively, are:

Q. In a voltmeter there are 20 divisions between the zero mark and 0.5 volt mark calculate the least count of voltmeter

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