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Charge after three time constants?

  1. Jan 15, 2014 #1
    1. The problem statement, all variables and given/known data
    A 10V supple is connected to a 2.2μF capacitor in series with a 10kΩ resistor. To what value will it have charged after three time constants?


    2. Relevant equations
    I know that T=RC but I have no idea beyond this point


    3. The attempt at a solution
    T=RC
    T=2.2μF*10kΩ
    T=22

    the rest is unknown to me, if someone could explain it to me that would be awesome.
     
  2. jcsd
  3. Jan 15, 2014 #2

    rude man

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    Either find the expression for a charging capacitor or derive it yourself. It's a simple linear, first-order, constant-coefficient differential equation. (Sum currents to zero at the capacitor-resistor junction.)
     
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