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Capacitors - Technical MCQs

Q1:

What is the impedance of a series RC circuit that consists of a 0.22 F capacitor and a 200-ohm resistor connected to a 3 kHz source?

A 214 ohms

B 313 ohms

C 414 ohms

D 880 ohms

ANS:B - 313 ohms

In a RC network first find Xc = 1/2 pi fc.

Xc = 1/2*3.14*3000*0.22*10^-6.

= 1/18840*.22*10^-6.

Xc = 241.26.


Z=sqrt (r^2 + Xc^2).
=sqrt (200^2 + 241.26^2).
=sqrt (40000 + 58148.49).
= sqrt (98148.49).

Z = 313.28.