Check out these pics (didn't post a single image since none of them included all of the connectors): https://www.google.fi/search?q=power+supply+connectors&tbm=isch&tbo=u&source=univ&sa=X&ei=QUzlU-a6MuK6ygOq2IDwBQ&ved=0CB4QsAQ&biw=1920&bih=979#imgdii=_
Google the names of the connectors to find out what they are used for and how they work.