1. The problem statement, all variables and given/known data You see this trace on your oscilloscope for an RC circuit. The vertical scale is 5volt/square and the horizontal scale is 50ms/square. What is the time constant of the RC circuit? 2. Relevant equations Vc(t) = Vo(e^(-t/RC) Vr(t) = -Vo * e^(-t/RC) t halftime = Tln(2) = .69T 3. The attempt at a solution So when the voltage is at its peak (15 V), that's Vo. and if I take that as V(t), it's V at 20 ms (approximately). Substituting this: 15 V = 15V(e^(.02/RC)) 1 = e^-.02/RC ln(1) = -.02/RC 0 = -.02/RC Cross multiplying to solve here doesn't help me. Is there another formula I can use?