Any Physicists or Electricians here?

[Hellspell]

Dont worry. I dread to think of ever messing around. Not after I was tricked into being given a 5000 volt shock by my teacher. Thats what the power brick said, it sounds crazy high to me. How would I calculate the curent that flowed through me at that time? Would I use I = V/R, or do I need to know the power rating of the power source?

Also, if im not becoming (more of) a bore, why do we say "voltage across" and not 'voltage supplied to', or 'electric potential of'.