Electronics - Series-Parallel Circuits - Discussion

5. 

The voltmeter will read 18 volts.

tfq5_1011_1.gif

[A]. True
[B]. False

Answer: Option A

Explanation:

No answer description available for this question.

Ranjan said: (Oct 15, 2012)  
Can you please explain me about the about the answer.

Shreya said: (Dec 31, 2013)  
Lets say point between R8 and R10 be A and point between R7 and R9 be B.

Now, R8, R10 in series so Rt1 = 2+3 = 5 ohm.

And R7, R9 in series so Rt2 = 1+4 = 5 ohm.

Rt=(Rt1Rt2)/(Rt1+Rt2) = 5/2 ohm.

Total current = V/Rt = (90*2)/5 = 36 amp.

Since Rt1 and Rt2 are equal therefore equal current will flow through each branch = 36/2 = 18 amp.

Voltage drop across R8 = 18*2 = 36v.

Potential at point A = 90-36 = 54v.

Voltage drop across R7 = 18*1 = 18v.

Potential at point B = 90-18 = 72v.

Potential diff. between A and B gives voltmeter reading = 72-54 = 18v.

Kiran V said: (Jan 16, 2017)  
Good explanation @Shreya.

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