# Electrical Engineering - RC Circuits - Discussion

### Discussion :: RC Circuits - General Questions (Q.No.19)

19.

In a series RC circuit, when the frequency and the resistance are halved, the impedance

 [A]. doubles [B]. is halved [C]. is reduced to one-fourth [D]. cannot be determined without values

Explanation:

No answer description available for this question.

 Anand said: (Jun 18, 2015) Total impedance= R-JXc.

 Anonymous said: (Nov 8, 2016) Please Given the explanation.

 Dhaval said: (May 4, 2017) Here, Z=R+Xc. Now resistance and frequency is halved so R become R/2 and Xc=1/2π(f/2)c => 2Xc=1/2πfc. Z'=R/2+ 2Xc so impedance neither double nor halved. So, It cannot determine without values.

 Manish said: (Oct 3, 2017) There is no explanation about capacitance so without value of capacitance we can't say anything.

 Noor Ul Islam said: (Aug 30, 2018) z =√((2R)^2+(2/wC)^2) because resistance is double and frequency is half. z = 2√((2R)^2+(2/wC)^2). So the impedence is double.