Electrical Engineering - RC Circuits - Discussion

Discussion :: RC Circuits - General Questions (Q.No.18)

18. 

When the frequency of the voltage applied to a series RC circuit is increased, the phase angle

[A]. increases
[B]. decreases
[C]. remains the same
[D]. becomes erratic

Answer: Option B

Explanation:

No answer description available for this question.

Amit Kumar Saha said: (May 18, 2012)  
We know, Xc=1/2*pi*f*c ------ i
Hence, from eqn. i, if f(frequency) increased, Xc gradually decreased.
Also we know, Phase angel= tan^-1(Xc/R)
So if Xc decreased, also phase angle gradually decreased.

Tapash said: (Jul 9, 2015)  
Any wide description about it.

Aleksandr said: (Feb 7, 2016)  
Phase angle = arctg ((XL-XC)/R), XL = 0, phase angle = arctg(-XC/R),

So tg(alpha) = -XC/R, when XC decrease tg (alpha) from minus go to 0 to be increased.

So alpha also from minus go to 0. So the question is how you consider angle increase or decrease. So if alpha from -40 goes to 0 it's decrease or increase?

Niru said: (Jan 8, 2018)  
Alpha=tan-1(xc/r).
xc=k(1/f).
Thus xc dec.

Alpha dec.

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