P = WATTS--p=e2/r or RXI2 or EXI
I = AMPS --- THE SQUARE ROOT OF P/R or P/E or E/R
E = VOLTS---E=IXR or P/Ior the square root of PXR
R = OHMS---R=E/I or e2/P or P/ I2


P = POWER IN WATTS
I = CURRENT IN AMPS
E =ELECTROMOTIVE FORCE IN VOLTS
R = RESISTANCE IN OHMS

ANY LETTER FOLLOWED BY A 2 MEANS THAT LETTER SQUARED (( multiply it by itself ))
THE / MEANS DIVIDED BY---- AND THE X MEANS MULTIPLY.