RC Circuit

Impedance Calculate

Examine Capacitor Resistor

Contribution to complex impedance Phasor diagram

You know that the voltage in a capacitive lags the current because the current must flow to build up the charge, and the voltage across the capacitor is proportional to that charge which is built up on the capacitor plates.

RC Impedance

For

= x10^ F =

= pF

at angular frequency		= x10^ rad/s,

frequency = x10^ Hz = kHz = MHz

and resistance R = x10^ ohms = kohms = Megohms,

the impedance is

Z = x10^ ohms = kohms = Megohms

at phase		= degrees.