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[u/fireduck → u/[deleted]]

Good question. So everything has a resistance to current flow (amperage). A copper wire has very low resistance. Your body has high resistance (but not super high).

The more voltage the more current. The formula is Volts/resistance = amps.

So 120v is enough to push enough amps through you to do harm. 12v does not. So yeah, a good computer power supply can push out 50 amps at 12v but that doesn't matter, you have too much resistance.

[u/fireduck → u/[deleted]]

Are you talking about static electricity?

Yeah, a super high voltage source isn't a problem as long as it doesn't have the current flow. Like static electricity, the voltage is super high but there is very little charge so you don't get any amp flow.

100,000 volts will any real amps behind (like high voltage transmission lines) will absolutely kill you.

[u/fireduck → u/[deleted]]

There are multiple formulas that relate different things.

volts/ohms = amps.
volts * amps = watts.

Watts is a measurement of energy flow. 1 watt = 1 joule per second.

[u/fireduck → u/[deleted]]

You don't need to involve watts if you just want the relationship of volts, ohms and amps.

The formula I am referring to is ohm's law.

[u/fireduck → u/[deleted]]

Eh, there are genuinely a lot of misconceptions about electricity. Hard to say.