Electrical Engineering - RC Circuits - Discussion
Discussion Forum : RC Circuits - General Questions (Q.No. 9)
9.
When the frequency of the source voltage decreases, the impedance of a parallel RC circuit
Discussion:
8 comments Page 1 of 1.
Raven zero said:
9 years ago
In parallel circuit 1/Z = 1/R + 1/Xc.
Since, Xc = 1/(2 * f * C) which is Xc is inversely proportional f.
Thus in the parallel circuit the higher the resistance the lower the total resistance(impedance)
therefore if the frequency decrease, the impedance will be decreased. How come it will be increased?
Since, Xc = 1/(2 * f * C) which is Xc is inversely proportional f.
Thus in the parallel circuit the higher the resistance the lower the total resistance(impedance)
therefore if the frequency decrease, the impedance will be decreased. How come it will be increased?
(1)
Fahad said:
1 decade ago
Impedance (reactance) has inverse relation with frequency for a capacitor (constant capacitance).
Rams said:
1 decade ago
In parallel circuits, Z = R+Xc.
Here Xc = 1/(2*pi*f*c).
Reactance inversely proportional to frequency.
As given in the problem supply frequency decreases means Xc is increases.
So obviously Z increases.
Here Xc = 1/(2*pi*f*c).
Reactance inversely proportional to frequency.
As given in the problem supply frequency decreases means Xc is increases.
So obviously Z increases.
Saurabh kumar said:
1 decade ago
We know that w = 2*pi*f.
So Xc = 1/2*pi*f*c.
& V^ = r^+xc^, Reactance inversely proportional to frequency.
Also, v = 1/2*pi*f, from this equation clearly we have seen that we is inversely proportion to the frequency but in this question we is decrease. so f is increase.
So Xc = 1/2*pi*f*c.
& V^ = r^+xc^, Reactance inversely proportional to frequency.
Also, v = 1/2*pi*f, from this equation clearly we have seen that we is inversely proportion to the frequency but in this question we is decrease. so f is increase.
Gulappa said:
8 years ago
Yes, agree @Raven.
Aamir said:
7 years ago
The correct answer must be B.
Vipin said:
7 years ago
Thank you @Rams.
Mohsin Khalid said:
7 years ago
Z = 1/√(1/R)^2+(WC)^2.
WC = 2πfC.
As f dec, the term (WC)^2 dec and as a result, overall denominator decreases, ultimately Z increases.
WC = 2πfC.
As f dec, the term (WC)^2 dec and as a result, overall denominator decreases, ultimately Z increases.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers