Electrical Engineering - RC Circuits - Discussion

Discussion :: RC Circuits - General Questions (Q.No.5)


In a series RC circuit, 12 V(rms) is measured across the resistor and 15 V(rms) is measured across the capacitor. The rms source voltage is

[A]. 3 V
[B]. 27 V
[C]. 19.2 V
[D]. 1.9 V

Answer: Option C


No answer description available for this question.

Sandhya said: (Aug 26, 2011)  
RMS source voltage=sqrt(12^2+15^2)=19.2v

Ponrajan said: (Mar 11, 2012)  
What is the formula to find rms value?

Poovizhi said: (May 18, 2012)  
To find the rms value of RC series circuit the formula is
Vrms^2= Vr^2+Vc^2
Vrms= square root of( Vr^2+Vc^2)

Mounika said: (Sep 16, 2012)  

Kiran said: (Dec 2, 2012)  
Vrms = sqrt of vr^2+vxc^2
= sqrt of 12^2+15^2
= 19.2v

Sanjeev Singh said: (Jul 21, 2013)  
Vrms = square root of( Vr^2+Vc^2)?

Suji said: (Mar 1, 2014)  
Please anyone give the correct solution for this problem.

Sathyaselva said: (Mar 7, 2014)  
What is the correct formula of V(rms) for rc series and parallel circuit?

Koti said: (Jul 4, 2014)  
In series circuit voltage is add/subtract with their polarity.

Vrms = Sqrt(Vc^2+Vr^2).

Where & how from this formula comes?

Vasiq said: (Jan 17, 2015)  
For everyone using the "Vrms = Sqrt(Vc^2+Vr^2)" equation, what is your source? I have never seen this equation before.

Nikku Kumar said: (Mar 1, 2015)  
Vrms^2 = 12^2+15^2 = 369.

Vrms^2 = 369.

Vrms = Root under 369.

Vrms = 19.20.

Praful said: (Aug 6, 2015)  
Is this formula applicable for RL circuit also?

Sunny said: (Sep 10, 2015)  
If L is include then what is Vrms=?

Gozie said: (Oct 14, 2016)  
I think from the phasor diagram, inductance Voltage (VL) is opposite capacitance-voltage (Vc). Therefore, if the circuit includes VR, Vc, and VL, the resultant Vrms will be sqrt (Vr^2 + (Vc - VL)^2).

Akhil P said: (Dec 22, 2019)  
Sqrt of 12^2+15^2 = 19.2.

Marbudki Toi said: (Aug 29, 2020)  
Can you explain to me in detail?

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