可调电阻器是一种可调的电子元件。它是由一个电阻体和一个转动或滑动系统组成。当电阻体的两个固定触电之间外加一个电压时，通过转动或滑动系统改变触点在电阻体上的位置，在动触点与固定触点之间便可得到一个与动触点位置成一定关系的电压。 它大多是用作分压器，这是电位器是一个四端元件。电位器基本上就是滑动变阻器，有几种样式，一般用在音箱音量开关和激光头功率大小调节.

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