One of the buttons says "click here to begin the electron counter." When you click that button, this is the screen you will see. A yellow line is drawn through the center of the simulation. This is meant to represent a plane in the metal. The counters show two seperate counts in each direction. The "total number of electrons crossing to the left" is a running total of how many electrons have crossed that plane to the left. The electrons that have "crossed in the last 30 seconds" is a rolling count that keeps track of the last thirty seconds. The same is true for the counters of electrons crossing to the right. To reset these counters, click the button that says "click here to reset the counters."
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