As far as I can tell, none of these come with the student edition of PSpice. The first problem is I can't find a model for any of these things. The second problem is I don't know how to import a custom part. Worst come to worst, I could make the part myself, but once again, I have no experience with this. Googling hasn't helped much, I can't really find good help for PSpice 9.2. I was hoping to find a library file I could just throw in with the rest of my libraries, but I haven't found any libraries floating around the internet. Is there some kind of PSpice parts database or something, where I could at least download the right part? It seems like you need to download a model file and then somehow import that. I watched a video on how to do it for LTspice and it seemed completely alien to anything I've done before. As I'm sure you can tell, I am not sure how to even start this. I don't even have a rough estimate for how long this will take. I thought of using a voltage switch + current switch to do a really rough simulation but I don't seem to have those parts either. I don't really need much more then that, actually. I just want the resistance to change when the break voltage is reached... That would probably be enough. Like I said though, I don't know how to approach this. I've been building everything in schematic mode so far so I don't know how the text stuff works at all.