OK, if 1.5 volts from batteries is safe, then what level of voltage is “dangerous?
it varies from person to person, but serious danger only appears when the voltage is higher than about 40 volts. The voltage of a typical battery is far below the 40 volts needed to electrocute you. AC wall outlets are 120V, which is far higher than the 40-volt threshold. 120 volts can force a large electric current through your skin, and therefore wall outlets are dangerous. The “AC” is not the problem, since an AC 12-volt power supply (such as the type used with laptop computers) is not dangerous, even though it is AC. The 12v computer supply DOES have the ability to produce large currents in wires, but its voltage is too low, and it can’t produce a large current in a human body because the skin is too resistive. Humans are electrically protected by their skin. Here’s a disgusting thought: remove your skin, and even a battery becomes a danger! If you have a big cut in your chest, don’t go sticking a 9-volt battery into it. If you have huge cuts on your hands, then don’t grab the term
