Thread Starter


Joined Dec 29, 2004
I am working with capacitor now and I have this question. I am applying a square wave (from 0 to 5V) on a RC circuit.
At the output ( at the resistor) I get a positive and negative values? why is that ?
I am suspecting the fact that the capacitor create a phase difference of -90 degree(between voltage and current)..but I cannot figure out the correct answer.
please can someone help me?

John Luciani

Joined Apr 3, 2007
when your square goes to 5V the capacitor charges to 5V (5V on the +terminal
and 0V on the -terminal). Your square wave then goes to 0V so you now have 0V
on the +terminal. Since the voltage across the capacitor cannot change instantly
and the +terminal is 5V greater than the -teminal the -terminal has to be at -5V.

(* jcl *)