I am confused about the following: in my lab, we all run electromagnets off of pretty beefy power supplies. Everyone else grounds their supply. Mine is floating. I do not have even a remotely good understanding of why they ground theirs. I don't see the advantage of it. Also, I want to use a decoupling capacitor (I think that is what they are called), to provide some additional stability. Everyone talks about connecting these between Vcc and Ground. Based on my understanding of how these work, I do not know why I should not be able to put one between the + and - terminals of my supply. Is there a reason I should not?
In short, I don't understand why I would want to ground my power supply and I don't understand why I cannot just put a capacitor between + and -.