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Rc circuit

  1. Apr 24, 2005 #1
    If there is a circuit with--Emf -5V and one 5ohm resistor and one 20 F capacitor, what is the current of the circuit?
    Will there be any effects on current because of capacitor? :smile:
     
  2. jcsd
  3. Apr 24, 2005 #2

    OlderDan

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    It depends on whether the emf is constant and how the resistor and capacitor are connect to the source. In all cases I can think of, the capacitor affects the current when a steady emf is first applied. After some time, it either has no effect, or it keeps current from flowing. If the emf is varying in time, it's a whole different problem.
     
  4. Apr 24, 2005 #3
    The capacitor will block the DC Current after a certain amount of time. If the supply is AC then it will be more complicated.

    If it's AC - you can have a look at: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/rcimp.html
     
  5. Apr 24, 2005 #4

    OlderDan

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    It will block the current through the capacitor, but not the current through the emf source and the resistor unless it is a series circuit. That has not been specified.
     
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