say 12v @ 1 amp. When you touch the + & - together there is a spark. What is that spark? Why is it so bright and hot from that initial contact, but after the contact point isn't as bright and hot. I was told by someone that it is reisistance. All I can think of is as the charge heads out to the + it meets resistance there and only part of that charge makes it into the air as heat / light. So is there some sorta high initial resistance?