1. The problem statement, all variables and given/known data 2. Relevant equations 3. The attempt at a solution All loops are clockwise; KVL Loop around 1V, 120kOhm and VBE (I1 is assigned to the loop): -1V + 120kOhm * I1 + VBE = 0 I1 = IB = 0.3V / 120kOhm = 2.5 * 10-6 A; Loop around 10kOhm, vCE (I2 is assigned to the loop); KVL Loop around 10kOhm, vo, and 20V (I3 is assigned to the loop): 10kOhm * I3 + 20V - vo = 0 vo = 10kOhm * (I2 - I3) 10kOhm * I3 +20V + (I3 - I2) * 10kOhm = 0 (1); At the node connecting the collector part of the transistor, Io and 10kOhm: I3 + (I2 - I3) + IC = 0 since Io = I2 - I3 IC = B * IB = 80 * 2.5 * 10-6 = 2 * 10-4 A I2 = -2 * 10-4 A (2); Subbing (2) into (1): 10kOhm * I3 +20V + (I3 + 2 * 10-4 A) * 10kOhm = 0 20kOhm * I3 = - 20V - 2 * 10-4 A * 10kOhm I3 = -22 / 20k A = -1.1 * 10-3 I2 - I3 = 9 * 10 -4 A ! = 6 * 10 -4 WRONG And I've been stuck redoing the same equations for a day now... Would be nice if someone could help find the problem in my "solution" so I can finally move on haha.