Hello Let's see, I give you an orientation, who you must learn is you, not because I know them all, but I already went through that. in single phase P = V x I x Fi cosine in three phase P = vx I x cosine of fi x Root of 3 you just have to clear the current of these formulas (I = P / (V x cosine of fi) if you want to know how to interpret some extra data (like Q) visit this page Electrical power - basic formulas - click here -