Is it wattage that kills you and not specifically amps
There is more than one reason that electricity can kill you. Probably the most popular one to talk about is cardiac fibrillation. This is caused mostly by AC circuits disturbing the regular rhythms of the heart and can be cause by as little as 10mA across the chest cavity as you suggest. Other issues can arise from less spoken about effects like electroporation of cell membranes and explosive vaporization of tissues. I'm sure you can imagine why people don't like talking about those. It's a bit disturbing. Electroporation causes your cells to become &quot;leaky&quot;, so parts like sodium and potassium pumps can't do their jobs anymore and the cell either enters apoptosis or necrosis if it doesn't just fall apart first. This can happen at the gap between the two sides of a button battery lodged in your esophagus (some excruciatingly sad stories can be told of that).  Sometimes you can survive these incidents, sometimes you can't. I'm not going to discuss explosive vaporization of tissue... for obvious reasons, but there is a good reason that you should NEVER put your hand into a Jacobs Ladder, no mater how thick your rubber boots are. Let's suffice to say, there are simply too many reasons that electricity can kill you to blame it on one phenomenon. If anybody really NEEDS the gory details, I'd be happy to discuss it further, but really? Electricity can be very dangerous when not well understood. It deserves and commands a great deal of respect.