times the resistance/impedance (ohms) Power (watts) = 75 amps times 75 amps times 4 ohms. Power = 22,500 watts! To find the voltage across the 4 ohm load to produce this power we need the following ...

Watts are units of electric power. Think of wattage as electricity at work when heating or illuminating a room in your home.

Don't worry too much about the wire radius, though, because the radius of the connection point enters the resistance formula only inside a logarithm; it has little influence on the final result unless ...