滑动变阻器是一个可以连续改变电阻值的可变电阻 ,它在电路中能起到调节电流的大小及两点间电压的作用 ,是电学中最基本、最常见的器材之一 ,也是高考重要考点之一 .但对于滑动变阻器的两种连接方式 (分压式与限流式 )的选用问题 ,学生经常会出错 .笔者在教学中发现学生主要对? A sliding rheostat is a variable resistor that can continuously change the resistance value. It can play the role of adjusting the current and the voltage between two points in the circuit. It is one of the most basic and common equipments in electrical engineering, and is also an important test center for college entrance examinations. One of them. However, students often make mistakes in the selection of the two types of connection (divider type and current limiting type) of the sliding rheostat.