So now that I'm taking Electronics 1, the course right after Linear Circuits (DC/AC), the whole parallel/series schematic thing is kicking my ***. Pic 1 (idealdiode) is an example of just a tricky way of drawing something in parallel: namely, a voltage drop. With the (ideal) diode off = open circuit, we can say that Vo = the drop across the rightmost 1k Ohm resistor. There is a voltage division going on for sure, that's how I solved the problem, but knowing the current, would we get the same answer if we just did I*1k ohm? When the (ideal) diode is on, it acts as a short (we can ignore the resistor). I have a hard time convincing myself that Vi = Vo when I tell myself that they are the same because the "voltage travels through the wire". Are we assuming Vi here to be connected to the same node as Vo, and also to ground? Is that why Vo = Vi, because they are both connected to the same 2 nodes? Again, I'm sure choosing a wiser set of words to express this would make it much easier to understand. In idealdiode2, with a <0 value for Vi, D1 is on = short, and D2 is off = open circuit. Here is where I have trouble. What would be a good way to express the voltage at the node above D2 and below the 1k ohm resistor? I have already solved these problems, with some good thought put along with the help of the solutions manual. I'm not asking for homework help, in other words; I don't want to get penalized. Basically, what I want to get out of this thread is a better way of explaining, and convincing myself, of the things explained above.