capacitor(urgent!)

Discussion in 'The Projects Forum' started by braddy, Apr 6, 2007.

  1. braddy

    Thread Starter Well-Known Member

    Dec 29, 2004
    83
    0
    Hi,
    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?
     
  2. John Luciani

    Active Member

    Apr 3, 2007
    477
    0
    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 *)

    ----

    www.luciani.org
     
  3. braddy

    Thread Starter Well-Known Member

    Dec 29, 2004
    83
    0
    Thank you John!
     
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