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Capacitor Discharge

  1. Oct 16, 2009 #1
    1. The problem statement, all variables and given/known data
    A capacitor is charged to 1 coulomb; the capacitance is 6.00×10-5 farads. Then a switch is closed which puts the capacitor in a closed circuit with a resistor; the resistance is 9.20×10^1 ohms. Calculate the charge on the capacitor after 4.00 milliseconds. (1 ms = 0.001 s)

    2. Relevant equations

    3. The attempt at a solution
    Final charge=1 Coulomb * 1.602E-19-.004/(92*6E-5)

  2. jcsd
  3. Oct 16, 2009 #2
    You are simply using Q = Qo*e^(-t/tau). And tau = R*C, t = 4E-3 s. Take another look at RC circuits and the charging and discharging capacitor relations.
  4. Oct 17, 2009 #3
    what is e
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