- #1

psparky

Gold Member

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Since V=IR and P=IV....and V^2/R=P

Lets say your body has a resistance of 2000 ohms and you get shocked by 120 volts. You receive 7.2 watts of power.

Now lets step to the left and get shocked by 480 volts with the same 2000 ohm body.

I now get 115.2 watts of power or roughly 16 times the electrocution of 120 volts.

Would you agree? Obviously, the assumption is that you would only feel 4 times the electrocution which I believe is wrong.

Same thing for arc flash. Bang two 120 volt wires together and you see a ball of flame about the size of your fist. (obviously can be deadly, do not try)

Bang two 480 volt wires together and you see 16 times the arc flash instead of the 4 times the arc flash you might think. (obviously limited by its transformer if applicable) (arc flash extremely deadly at 480, you will die, do not try)

In the arc flash example I am also assuming the same resistance of the copper and buss and so forth. According to V^2/R=P......my theories are correct....What do you think?

So 2400 volt would give 400 times the electrocution and arc flash as say 120 volt.

I can't help but notice this pattern (20)^2=400. Voltage gain squared equals power gain when using the same resistance.