Amperage is set by the resistance of the human body. That's in the order of 2kOhm, so at 50V, you get a current of 25mA. That's in the zone where it becomes quite intense for you.
At 12V, we are just talking about 6mA, where you can feel the electricity but it should not be hurting too much.
At 12V, we are just talking about 6mA, where you can feel the electricity but it should not be hurting too much.