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Dischargeing a capacitor

  1. Apr 12, 2014 #1
    I have a test coming up and i know what some question will be on. One question is about the time it takes to discharge a capacitor from "full" to a given point or percent of initial charge. How would i go about doing this.

    I know the it has to do with the time constant RC and the equation of discharging a capacitor i just don't know how i would find the time it takes.

    3. The attempt at a solution
  2. jcsd
  3. Apr 12, 2014 #2


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    You said you know the equation for discharging a capacitor, so what is that equation? Is it not an equation for the TIME to discharge a capacitor? If not, what is it?
  4. Apr 12, 2014 #3
    well i guess i should have said i think i need to use it and its [q=q(naught)e^(-t/RC)]
  5. Apr 12, 2014 #4
    does it just become [(percent droped)=e^(t/rc) i will probably be given r and c
  6. Apr 12, 2014 #5


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    Yes, you have right idea, so now how do you solve that for t ?
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