# Electrical Engineering - RC Circuits - Discussion

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

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

Explanation:

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

 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.