Quite a simple question really; I'm just learning about some simple electronics, the link below is an exam from Norway. On page 4 there is a figure. I am simply wondering what this type of diagram, schematic or whatever is called in english? Knowing the english word would make it so much easier for me to find information about it on the web... www.hist.no/aft/iet/elkraft/pls/eksamensoppgaver/eksopp091202.pdf As long as I'm here, what is the R and S (top and bottom) on this figure? Do they stand for something? If you know of any sites where I can learn the basics of this type of diagram I would surely appreciate it, thx!