1. The problem statement, all variables and given/known data http://kpopgames.net/res.jpg [Broken] In the circuit shown, R1 = 1 ohms, R2 = 10 ohms, I1 = 3.5 A and I4 = 2 A. The battery has negligible internal resistance. If the rate at which R4 is dissipating electrical energy is 20W: a) What is R4 b) What is R3 c) What is I3 d) What is the emf of the battery? 2. Relevant equations 3. The attempt at a solution I solved for a: P = (I4)R R4 20 W = 4 R4 R4 = 5 ohms. Now Im stuck there. Honestly, I dont know what the R3 illustration means. I know that R2 and R4 are parallel to each other. But the R3 which is like a diagonal confuses me. What does that R3 mean? And how do I go about to solve this? Does the R3 mean that it connects the R2 and R4, which makes them in series? Im reallly confused and I dont have a book to consult this to.