Lots of time I’ve heard about electricity things like: the one that kills you is the current, don’t worry about large voltages (tasers for example have thousand of voltage). But using Ohm’s Law, if the voltage is big, the current is big. Then why it’s said that about current?
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You can not have one without the other. In the case of a taser or other similar devices they can supply a lot of voltage but only in open circuit. As soon as you close the circuit, for example by touching both ends to your body, the power supply in them is not able to sustain the high voltage and the voltage drops to almost nothing. What these devices are rated on is how much energy they can deliver in each pulse. If they keep the energy low enough then it will not cause much harm.
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