The Potentiometer Block contains a 5K ohm potentiometer that is designed to work best with 3 volts, and using the LED Block or the Bi-color LED Block. Potentiometers control things over a range, compared with switches that turn things on or off. In the case of the LED, a potentiometer can control the light in changing from dim to bright. To learn more about the potentiometer see our "Range" learning exploration.

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