I was doing an experiment to determine the capacitance of a capacitor in a circuit with a particular resistor R. This was also set up to an oscillator and oscillscope. Now t=RC, where t is the time constant. At a time of t, the value of V across the capacitor is .63(V_0), says my guide. So if I know V_0, I could workout out the time constant t, and hence the capacitance. But what is V_0? The guide does not state. I am confused, and think I may have done the experiment wrong. I have an averaged value of the max V across the capacitor and the time it took to reachhis value if that's any help.... Is this value of V_0?