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Resistors, capacitors, diodes
A photo resistor decreases in resistance as illumination increases. I don't believe there are any discrete components that accomplish what you are asking. You may need to use a photo resistor, combined with a transistor to invert this operation.
A step resistor is a type of resistor that provides discrete resistance values, allowing for precise adjustments in electrical circuits. It typically consists of multiple resistive elements configured to create specific voltage or current levels in a stepwise manner. This design is useful in applications like audio equipment, where it can control volume or tone settings, and in testing equipment for calibrating measurements. By selecting different steps, users can achieve the desired resistance without the need for continuous adjustment.
Discrete is something that is not continuous, or in other words. Not doing it continuous.
Coppersmith's discrete logarithm method