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What is the current through Resistor on RC circuit

  1. Feb 28, 2012 #1
    1. The problem statement, all variables and given/known data

    The diagram below depicts an RC-circuit where C = 1.70 μF, R1 = 18.0 Ω, R2 = 10.0 Ω, and V0 = 2.0 V.
    a.) What is the current through R1 immediately after the switch S is closed?
    b.) What is the current through R2 after the switch S has been closed for a very long time? Assume that the battery does not go dead.

    2. Relevant equations
    I=E/R


    3. The attempt at a solution
    I got part A. I divided 2V by 18Ω to get 0.111A which is correct. I know when the switch is initially closed current flows through the capacitor and when it is charge current no longer flows through. I figured part B you would just find the current through 2/(18+10)=0.0714 which turned out incorrect so I'm not sure what to try next. Also I don't think the capacitance is relevant, so I hope I'm not wrong there. Any help would be great
     

    Attached Files:

  2. jcsd
  3. Feb 28, 2012 #2

    gneill

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    Staff: Mentor

    Your method and current value looks correct. Do they want any particular units, notation, or significant figures in the answer format?
     
  4. Feb 28, 2012 #3
    It looks like I forgot to enter the 0 after the decimal. Well, thats embarassing
     
  5. Feb 28, 2012 #4

    gneill

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    Staff: Mentor

    Been there, done that :smile:
     
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