Question

The current flowing through a resistor connected in an electric circuit and potential difference across its end are connected to an ammeter and a Voltmer. Find the least count Of the voltmeter and ammeter

Answer 1

Answer:

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Answer 2

Answer:

Least count : the smallest reading which can be accurately measured with a Vernier caliper, screw guage or any device is called its least count.

Least can be measured by using formula,

\textbf{Least count}=\frac{\textbf{Range}}{\textbf{number of divisions}}Least count=number of divisionsRange

for Ammeter,

least count of Ammeter = Range/number of divisions

Range = 0.4 - 0.2 = 0.2A

number of divisions = 10

so, least count of Ammeter = 0.2/10 = 0.02

here, main scale = 0.2A , n = 5 and least count = 0.02

reading of Ammeter = main scale + n × least count of Ammeter

= 0.2 + 5 × 0.02 = 0.2 + 0.1 = 0.3A

for voltmeter,

range = 2 - 1 = 1V

number of divisions = 10

so, least count of voltmeter = 1/10 = 0.1

here, main scale = 2V, n = 1 and least count of voltmeter = 0.1

reading of voltmeter = main scale + n × least count of voltmeter

= 2 + 1 × 0.1 = 2.1V