Rotary Potentiometers and Rheostats (Rotary Potentiometers and Rheostats) are two basic components commonly used in electronics, which play an important role in regulating current and voltage in a circuit. The rotary potentiometer, also known as the variable resistor, is mainly composed of three parts: a rotating shaft, a resistance body and a brush. Through the operation of the rotating axis, the brush slides on the surface of the resistance body, thereby changing the resistance value in the circuit, and thus realizing the precise regulation of voltage or current. Rheostat is a more generalized device for adjusting resistance, including two kinds of rotary and sliding. The basic principle is to adjust the resistance value in the circuit by changing the effective length of the resistance element or the position of the contact point, and then affect the current and voltage.

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