Ok, so i've been struggling with understanding voltage down to the electron level. I know a voltage by itself has no meaning. We want a voltage difference. i.e. voltage diff between point A and B and that ground really has no meaning except as a reference. and i know that current is the movement of charge and that voltage is the electric field. my question is as follows. Say I have an NMOS transistor which i am turning on and off with a switch. being a high impedance input (gate) there will be very minimal current draw.perhaps current to charge the line+gate capacitance and leakage current. If this is considered a transmission line, we will see the voltage move down the trace as a wave perhaps taking 1ns to move 6 inches. what exactly is happening here? How is the electric field moving down? is the voltage proportional to the number of electrons? i know the voltage is a force, but the force has to come from something. Thanks!