滑动变阻器是电学实验中的一种基本而又简单的实验器材.电学实验中,普遍采用滑动变阻器组成控制电路,搞清它在电路中的作用对于选择和安排控制电路,做好电学实验是非常重要的.滑动变阻器的作用是控制电路中的电流或电压达到某一指定的数值,或使其在一定范围内连续变化,即通常所说法的限流和分压. The sliding rheostat is a basic and simple experimental equipment in electrical experiments. In electrical experiments, sliding rheostats are generally used to form the control circuit, to find out its role in the circuit is very good for selecting and arranging control circuits and doing electrical experiments well. Important. The role of the sliding rheostat is to control the current or voltage in the circuit to reach a specified value, or to make it continuously change within a certain range, that is, the current limitation and partial pressure of the so-called method.