1. The problem statement, all variables and given/known data The question is given in the thumbnail... 2. Relevant equations R = resistance P = power V = voltage I = current R = V / I P = V * I P = I * R P = V^2 / R 3. The attempt at a solution The attempt at a solution is also given in the thumbnail... I know that the total voltage is 3V and after resistor 1: 3V - 1.8V that there will be 1.2 volts remaining. So i'm assuming from here (since I was given the current for resistor 2) that the 1.2 volts carries over to resistor 3, allowing me to determine the resistance r = 1.2v / 0.06a = 20. Here is where i'm stuck. With resistor 4, how do I know whether the volts or the current is the value that carries over? I know it has to be one of those two values seeing as how resistor 4 gives you its resistance, so if I were to add the voltage or current to it, I could calculate everything I need. So the question stands, is it the 1.2 volts that carries over to resistor 4, or the 0.06 amps?