system
Given the following post, respond as if you're commenting on Reddit:
human
Do electrons/energy build up at the entrance to the resistor?

I know a resistor limits the amount of current that flows in a circuit, but does this cause a buildup of electrons, heat, or energy at the entrance of the resistor?
gpt
Voltage builds up, current (actual electrons) does not. Think of it this way:

Just because there is a dam doesn't mean the steady-state flow of the river is different. If the damn tried to slow the flow of the river (too much), the river would crest the dam and it would catastrophically fail.

Voltage is the height of the water behind the dam relative to the water on the other side, current is the water flowing through from the high side of the dam to the low side. 

It's not a *perfect* example, since there really is no 'buildup time' for a resistor like there is for a dam (say right after construction was completed, or after a drought), but it's a helpful visualization.