How does a potentiometer affect current?

A potentiometer is a variable resistor that adjusts the resistance in a circuit, which directly influences the current flow according to Ohm's Law (I = V/R). By changing the position of the wiper, the resistance can be increased or decreased, thereby altering the current for a given voltage. This allows for precise control of current, making potentiometers useful in applications like volume controls and light dimmers.