1. The problem statement, all variables and given/known data Capacitor, C1, is initially charged so that it has a potential difference of 12V. At time t=0, switch S1 is closed allowing the capacitor to discharge through resistor R1. At t=5, the potential across the capacitor has fallen to 6V. At what time will the potential across the capacitor reach 3V? 2. Relevant equations V=Voe^(-t/RC) 3. The attempt at a solution 6=12e^(-5/RC) The RC is confusing to me. I'm not sure how what I'm supposed to do with it.