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Find t in terms of RC

  1. Feb 4, 2010 #1
    1. The problem statement, all variables and given/known data

    The capacitor in an circuit is initially uncharged
    In terms of R and C, determine the time required for the charge on the capacitor to rise to 50% of its final value.

    In terms of R and C, determine the time required for the initial current to drop to 10% of its initial value
    2. Relevant equations


    I know i need to use Q=CV(1-e^-t/RC)
    But I don't know how to put it all together.

    3. The attempt at a solution
     
  2. jcsd
  3. Feb 4, 2010 #2

    tiny-tim

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    Hi wildredhead! :smile:

    (try using the X2 tag just above the Reply box :wink:)
    Show us how far you've got, and where you're stuck, and then we'll know how to help! :smile:
     
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