Hello! If we want to find i3, we can apply the superposition theorem to the circuit below. It gives For V2 set to 0: i3' = V1 / R1 For V1 set to 0: i3'' = V2 / (R1 || R2) i3 = i3' - i3'' = V1/R1 - V2 / (R1 || R2) i3 = 10 / 500 - 2.5 / 83.3 = -0.01A My question is Do the i3' and i3'' currents really exist. By exist I mean part of electrons flowing through V2 flow in one direction and the other part flow in the opposite direction? And when i3 is measured it is the net current of i3' and i3''. Or only i3 exists so all electrons flow through V2 in the same direction. If so how does the superposition happens? E. g., do V1's electric field interact with V2's electric field "directly"? Or it is this way, if we look at a single electron which flows through V2's branch the force applied by V1's field sums up with force applied by V2's field and the resulting force defines the electron's speed and direction? If so, how to calculate the values of the force applied by V1 and the force applied by V2? So in general, what I want to know is how does superposition happens in electrical circuits? Thank you!