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Topics covered in this informative video: potentiometer, electrical engineering, basic electronics, what is a resistor, resistors in series, variable resistor, power electronics, current limiting, Carbon film, carbon composite, Metal film, Potentiometer, Thermistor, RTD, LDR, Light dependant resistor, SMD, rheostat and much much more.
TL;DR: Yes, but the effect is often negligible or the application does not care. When it matters, we can minimize the effect with appropriate designs (i.e. without coiled resistors).