I'm a 31yr old female taking an electricians class to take my Apprentice test in May. I don't understand how I would show any work for this question or if I'm posting in the correct category... My question is about Ohms law. There are 3 different formulas to plug numbers into Ohms law E/I E2/P P/i2. I couldn't figure out how to make a square sign for the E & I. So my question is can someone tell me how I figure out what numbers or where I find the numbers to plug into this formula?? Also, can someone give me an example scenario where I can figure out which formula to use and see if I'm correct??