Learning about ohm's law, we can see in this picture that the greater the ohms a resistor inflicts, the less luminescence a bulb will become. Due to the lack of voltage running through the wires from the power or ground. The smallest resistor produced the brightest light.
In this picture, there wasn't a full demonstration available, but the potentiometer was able to adjust for the amount of current to flow through. Turning the knob allowed more or restricted more energy to pass through the potentiometer.
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