Question: can 12 volt ac kill you?
Answer: The resistance of the human body is anywhere from 100,000 ohms (dry skin) to 1,000 ohms (open wound). In the former case, you'd need 50,000Volts to reach 500mA, in the latter case, it would be 500Volts. So, no, 12 volts won't kill you. ... Because 12 volts is not dangerous even though the battery be capable of 500,000 ma!