AND....AC is more dangerous than an equal voltage of DC.
Allow me to elaborate a bit.
Current is measured in a unit call Amperes (or just Amps). Current is a flow of electrons. They flow on the *outside of bare wiring and metal (conducting) objects. This is why insulation is on wiring, so you can't touch the wire and get shocked from it.
When you do happen to touch something that is 'hot' it is this flow of electrons that flows thru your body, depending on how much current and voltage there is, and on what your body chemistry is also. Your body may have more or less of what is needed to conduct electricity in it, such as water and salts and so on.
If the current is sever enough and/or passes close enough to vital organs, such as your heart, brain, or lungs, etc it can cause them physical damage or cause them to convulse or seize. Obviously this won't be a happy thing for you.......so people have learned to be careful around electricity.