1. The problem statement, all variables and given/known data I am able to solve most of the DC circuit problems we're given, but I seem to be missing something conceptually when it comes to finding current that passes through individual resistors when they are in parallel. An example problem would be #10 at this link: http://www.ahsd.org/science/stroyan/APPhysics/ch17/apc1718wq/APC17WQ4.HTM [Broken] Where the correct answer is 1.2 A. 2. Relevant equations I know that I = V/R, and that in parallel resistors the voltage is divided equally between branches and the voltage in each branch is equal to the original, which is 15 V in this case. 3. The attempt at a solution What I'm not sure is what resistance to plug in. According to the problem the resistance to use would be 12.5 ohms (R = V/I = 15 V / 1.2 A). I have no idea where this equivalent resistance came from and why it's used for the 2.7 ohm resistor. Any pointers would be appreciated!