滑动变阻器是重要的电路控制仪器.用它作分压器时,会出现两个电路端口——输入端和输出端,从电路结构上看和变压器有相似之处,容易混淆.本文从比较的角度对二者加以区别. The sliding rheostat is an important circuit control instrument. When it is used as a voltage divider, two circuit ports—input and output—appear to be similar to the transformer in terms of circuit structure. It is easy to confuse this article. The angle distinguishes the two.