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A digital potentiometer, also known as a digital variable resistor, is an electronic component that digitally controls resistance in a circuit. It replaces a mechanical potentiometer, using digital signals instead of a physical knob to adjust resistance. 

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Colour theory is essential for enhancing depth, mood, and impact in art, giving drawings a professional look. Colours have three main properties: hue (the colour itself, like red or blue), value (how light or dark a colour is, affecting contrast and depth), and intensity (the brightness or dullness of a colour).