Electrical Engineering - RC Circuits - Discussion

Discussion :: RC Circuits - General Questions (Q.No.21)

21. 

A 12 k resistor is in series with a 0.02 F capacitor across a 1.2 kHz ac source. If the current is expressed in polar form as I = 0.30° mA, what is the source voltage expressed in polar form?

[A]. 45.6 V
[B]. 411.3 V
[C]. 0.411 V
[D]. 4.11 V

Answer: Option D

Explanation:

No answer description available for this question.

Selva said: (Mar 9, 2012)  
FROM OHM'S LAW V=IZ

Z=Sqr(R^2+Xc^2)

Xc=(1/(2*pi*f*C))

Xc=(10^3/(2*pi*1.2*0.02))

=(1000/0.15)=6666.67 ohms

Z=sqr(12000^2+6666.67^2)=13727.508 ohms

V=IZ=13727.508*0.3 mA

=4.11 volts

Chester said: (Jul 26, 2017)  
Answer should be in mV.

Nomiki said: (Jun 11, 2019)  
The answer should be in Volts.

Rimah said: (Sep 13, 2019)  
Why we have to the square the resistance and capacitance values?

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