1. The problem statement, all variables and given/known data 2. Relevant equations Series Vt= V1 + V2 + V3 etc It = I1 = I2 = I3 etc Parallel Vt = V1 = V2 = V3 etc It = I1 + I2 + I3 3. The attempt at a solution Vt= 20V V2= 5.0 V V4= 8.0V It= 150 mA I2= 40 mA Find I3, and I4 I've solved for the values of V already V1 = 7.0V V3 = 5.0V So Vt = V1+V2=V3+V4 = 7.0V + 5.0V + 8.0V = 20V But I'm getting confused on solving for I which is current. I1 is in series with I2 and I4, but I2 is also parallel to I3. So which set of laws would I apply for solving for I3? I know I1=I4 since they're in series. I'm assuming I1=I1=It - I2 = 150 mA - 40mA = 110mA But still stuck on how to solve for I3, since its not stated the bulbs are identical so I'm unsure if I3 would also be 40mA. I'd appreciate any help I can receive.