My professor gave us a formula for the left-over output AC voltage in a half-wave rectifier. This formula was given without any calculus or explanation as to how it was obtained.
The Attempt at a Solution
I don't know if Vm is the peak input voltage or the peak secondary voltage (see image below). I do know that Vth is the threshold voltage of a diode; 0.7V for Silicon and 0.3V for Germanium.
Does anybody know how this formula was obtained? I don't have any information in my textbook on it and I've read the chapters twice.