What happens when the wiper of a potentiometer is moved?

When the wiper of a potentiometer is moved, it effectively changes the point at which the output voltage is taken from the resistive element of the potentiometer. This adjustment alters the resistive division of the input voltage across the potentiometer's total resistance.

As the wiper moves, it segments the potentiometer into two parts: one side connected to the voltage source and the other leading to ground or the lower potential. This change in position changes the ratio of resistance faced by the output voltage. Consequently, the output voltage varies according to the new position of the wiper, which directly relates to the amount of voltage that appears across the load connected to it.

Therefore, the correct answer highlights how the output voltage changes with the movement of the wiper along the resistive path, showcasing the fundamental operating principle of a potentiometer as a voltage divider.