<snip>
Smitty says: What does r have to do with watts. I thought it was E x I
<unsnip>
Use the rest of the ohm's law equations, E=I*R I=E/R R=E/I.
In the equation P=E*I substitute I*R for the E and you get P= I*R*I or P=I2R
or substitute E/R for the I and you get P= E*E/R or P=E2/R
Although I think you jest...
Frank DuVal