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• Mains electricity is 230V in Europe, usually 110V or 220V in the USA: that is enough "pressure" to push the current through you and, if it goes through your heart or brain, it can kill you even if there's only a tiny bit of current. The amount of current it takes to kill someone is not much: about 0.2A (200 milliamps), which is about enough to light a 40Watt lightbulb.