This program is very simple just select what unit you want to find such as volts(E) and, plug in what information you have such as watts and current (P,I) and it does the math work for you. no remembering the formulas!
if you have any problems or suggestions i will take them at flyingelvis34@yahoo.com and please have a subject that has the word "calc" on it or something so i know its not spam

Volts= E
Current or Amps= I
Watts =P
Resistance =R