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Voltage across a capacitor

  1. Feb 2, 2004 #1
    How do you calculate the maximum voltage across a capacitor in an L,R,C series circuit?
  2. jcsd
  3. Feb 3, 2004 #2
    It depends on the input current, is it AC or DC?

    If DC then Vc=Vcc (V across cap=supply )
    If AC then it depends on the Fq of Vcc and the impedance of the LRC circuit. ( which is a characteristic of thier respective values)
    Where: Z= Sqrt (R^2 * ((Xl-Xc) ^2))
    WhereXl is inductive reactance and Xc is capacitive reactance

    The answer will be a point in time of a value that changes over time. In other words since Vcc varies over time (Fq) so will the voltage over time.
    Last edited: Feb 3, 2004
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