Consider the scale of a voltmeter shown in the diagram and answer the following questions
(a) what is the least count of the voltmeter
(b) what is the reading shown by the voltmeter
(c) If this voltmeter is Connected across a resistor of 20ohm how much current is flowing through the resistor
—CBSE2019.
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The same to you soon love you so that we have a good time for the day of work to be a part time for
drparvinderkour:
Han never mind @singhutkarsh
Actually the diagram was not given i really wanted to earn points but now i am sorry.
Could you please add your question again
I would greatly like to answer that now
Okay sir
Answered by
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(a) least count of voltmeter = range/number of divisions on voltmeter scale
here, range = (1.5 - 0)= (3.0 - 1.5)= 1.5
number of divisions on voltmeter scale = 10
so, least count of voltmeter = 1.5/10 = 0.15
(b) reason of voltmeter = main scale + n × least count
here, main scale = 1.5V , n = 2 and least count = 0.15
so, reading of voltmeter = 1.5 + 2 × 0.15
= 1.5 + 0.3 = 1.8V
(c) reading of voltmeter is 1.8V
resistance of resistor is 20 ohms.
from Ohm's law,
V = IR => I = V/R = 1.8/20 = 0.09A
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