1. The problem statement, all variables and given/known data A circuit is constructed with five resistors and one real battery as shown above right. We model. The real battery as an ideal emf V = 12 V in series with an internal resistance r as shown above left. The values for the resistors are: R1 = R3 = 30 Ω, R4 = R5 = 78 Ω and R2 = 138 Ω. The measured voltage across the terminals of the batery is Vbattery = 11.56 V. What is the power through R2? 2. Relevant equations V=IR P = IV Kirchoff's laws 3. The attempt at a solution I have already found the currents I1 and I3. Also, I think that I2 = I1 - I3. I tried plugging that into P = IV, and did not get the correct answer. It could be my units or my previous equation. I have current in amps and voltage in volts. I do not know what I am doing wrong.