This post is similar to the one that I made the other day. There are two problems that I am having trouble understanding. The link is below: http://img510.imageshack.us/img510/4396/diodeproblem.jpg [Broken] They are numbered 4-5 (Ignore 3) . Once again I know the predictions are correct , because I did them in class. (This was a while back and I'm taking notes now) #4 If the AC source was on the positive cycle then the diode would be reverse bias. Wouldn't the diode have a .7 volt drop with the resistor having a 0 volt drop or is it true that the diode takes control of the source voltage? #5 The same goes here since the sum of the voltages is -5 volts does the voltages of the diode become source, whereas the resistor becomes zero? I have a feeling this is true, I just always thought a diode stays at a constant +7 or -7 volts.