滑动变阻器是电学重要仪器,是中考的必考知识,如何帮助学生做好复习,本人做了以下归类,取得较好效果·一、按一定要求把滑动变阻器连入电路例1如图1所示,当滑动变阻器的滑片P向左滑动时,要使小灯泡变暗,线头M应接滑动变阻器的A端还是B端?分析与解答:要使小灯泡变暗即电路中电流 Sliding rheostat is an important electrical instrument, is the examination of the examination of knowledge, how to help students do a good job review, I have done the following classification, to obtain better results. First, according to certain requirements to connect the sliding rheostat into the circuit Example 1 as shown in Figure 1 Shows that when the slide of the sliding varistor slides to the left, make the small light bulb dim, and the wire M should be connected to the A or B end of the sliding varistor? Analysis and solution: To make the small light bulb dark, that is, the current in the circuit