Imagine an empty pipe filled with marbles. If we apply a "push" with a voltage, on one marble (charge), it will push the next marble and out falls a marble on the other end of the pipe. This is how electrons move in the wire, there is always electrons ready to move, they only require a potential difference to push the charge and hence set off a chain of an electric charge in motion. Thus the near instant electric charge that powers our lamp did not have to travel the whole length of the wire.

This is indeed an eye-opener.
You brought the terms to my level, I just got a clear understanding of the principle of electric current moving through a conductor, a simple breakdown of the concept of resistance and why resistance R is measured as rate of the Area (A) to length, L of a conductor, and many other insights.
I guess you are in the teaching profession, I can only be right about that!...
Milestones in the history of electricity was simply presented too...
This is in short a nice write up Sir, even a social scientist will be able to get three or four things... Thanks for sharing @greenrun