Question:

Regard as a high school built to handle 1500 students but attended by 2500 students. Between classes the halls are crowded with students moving to their next class. About an hour subsequent to school but the halls are practically empty and the students from the track team zip through those halls at a fast pace. Which situation is a good analogy for the movement of charge through a circuit?

Ans:

A circuit is so crowded with charged particles participating in the flow that for a typical current even though the average velocity of a charged particle is very small a huge number of charged particles pass a given point in the circuit every second.