The Pain of Electricity (AC versus DC) shows you how painful AC and DC are, and is there a difference between them. Check out this informative, yet admittedly hilarious at times, video.
Watch the video. Remember – don’t try this at home. Do not repeat the tests yourself. Electricity can be dangerous. Even as low as 9V voltage can kill at certain conditions, but fortunately a 9V battery does not have enough voltage to kill a person by testing it on the tongue. If the battery can make an almost direct connection to the nervous system, it can kill. So it is a good idea to keep the voltages out of your mouth.