Question
Download Solution PDFA voltmeter of resistance 150 Ω is connected across A and B in the given circuit. The reading of voltmeter will be :
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFCalculation:
We know that the voltmeter is always connected in parallel.
The voltmeter resistance is given as 150 Ω and is connected across AB.
This means 150 Ω is connected in parallel with 100 Ω .
The resistance across AB will be a parallel combination of 150 and 100 Ω resistors.
The resistance across AB = (150) II (100)
= 150*100/(150 + 100)
= 60 Ω .
The net resistance of the circuit would be series combination of 60 and 100 Ω .
R = 60 + 100
= 160 Ω.
Current I = V/R
I = 40/160
= 0.25.
The voltage across AB will be the voltmeter reading which is equal to I*R.
Voltmeter reading = 0.25*60
= 15 Volts.
The correct answer is option (3)
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