Your skin is a somewhat decent insulator for the voltages you come across daily, AA batteries are 1.5V, but even car batteries at 12V, or even voltages as high as 30V aren’t enough to be felt by most people
However some areas, most notably your mouth, eyes and nose, have lower resistance and there you can feel even voltages as low as a AA, although not very much, at about 5-10V it starts becoming pretty painful on your tongue
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