1. The problem statement, all variables and given/known data Can somebody please explain to me what i did wrong here? Got exam tomorrow and it would probably be usefull to know.. Thx 2. Relevant equations axb = a*b/(a+b) 3. The attempt at a solution First i tried finding the voltage over 1.5R x R.. Then divide that voltage over R to find the current over R... For some strange reason this is wrong. Plz someone help me to understand why..