20 năm cũ bị phá hủy bởi khổng lồ dildo

The answer is, they don't.

They are accelerated by the electric field before each collision with the lattice.

As a junction, how do the correct number of electrons go down each path?

Well, they're guided by the electric field, which extends everywhere throughout the circuit.

The fields are the main actors, extending everywhere throughout the circuit.