WRONG! Sure, it's the current that kills, but that current is DEPENDANT on voltage-you see, every circuit, even the human body, has electrical resistance. I used to hook myself up to a 90 AMP baterry charger in a shop to prove to people that it was safe-12v from the battery charger was not enough voltage to overcome my electrical resistance. On the extreme opposit end, I have been hit with 40,000 volts from a high-performance ignition coil-the voltage went it through one hand and a spark flew from the other. But no internal damge was done, because the ignition coil lacked the CURRENT necessary.
So, the two components needed are 1) Enough current to fry something and 2) Enough voltage to pass that amount of current. Houshold electrical wiring easily has enough current capacity to electicute someone, but how many WATTS is a person at 120v? Watts, being the measure of volts x amps. Ohms being the resistance of the circuit, in this case, the human body, is volts/amps. It takes twice as much voltage to pass twice as much current through a given amount of resistance, therefore, if I can pass .5 AMPS at 120v, I can pass 1 amp at 240v.
Lets say my body has 600 Ohms resistance. Since 120/600=.2, only .2 Amps will pass through my body. Houshold wirering can carry 14-16Amps, so wiring is not a limmiting factor.
Of course, the same calculation for 240v gives me .4 Amps, which is alomst enough to stop my heart. So if, say, my hands were sweaty or something, my resistance would be slightly lower, the 240 might kill me where the 120 would not.
Suicide is painless...........