Hello everyone, I think this is very simple. I have very little knowledge about electricity and would like to understand a bit more about a simple experiment I was recently shown: Basically a steel nail was connected to an electrical circuit at both ends. The two electrical contacts to which it was connected were coming out of a wooden box (there must be a transformer or something like that inside right?). When the current started flowing, the nail got red hot really fast and then melted and broke. After that, a man touched both of the terminals and said he didn't feel a thing and it was safe to touch it even with the current flowing, yet it would melt a steel nail in ten seconds or so. If I understood correctly, the circuit was connected to a socket in the wall ( 220 V ). I have spent several hours googling for information on metal heating using electricity, but couldn't find anything I would be interested in. Mostly stuff about induction heating etc. I understand that to heat metal you need low voltage and high current? but isn't current deadly? I would appreciate any information. You don't have to try and explain everything carefully, just a rough explanation would be more than enough, I can use the internet and books to figure things out. Thanks in advance :D.