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滑动变阻器的作用是初中电学里的一个重点和难点。搞好滑动变阻器作用的教学,不仅能使学生掌握好滑动变阻器本身,同时对理解整个初中物理第八章《电流的定律》也有十分重要的作用。我在教学中尝试着通过演示实验进行教学,收到一定的效果。在按照教材进行了滑动变阻器的构造、原理、作用等的教学以后,补充《对滑动变阻器作用的进一步探讨》一课,通过演示实验进行教学。步骤如下: (1)进行“滑动变阻器的降位作用”的教学。将电源、电灯、电键、安培表、伏特表、滑动变阻器照图1所示连接成电路。图中(A)是测出
The role of the sliding rheostat is a key and difficult point in junior high school electricity. Doing a good job of teaching the function of the sliding rheostat can not only make students master the sliding rheostat itself, but also has a very important role in understanding the eighth chapter of the entire junior middle school physics “The Law of Currents”. In my teaching, I tried to teach through demonstration experiments and received certain results. After teaching the structure, principle, and function of the sliding varistor in accordance with the teaching materials, a lesson entitled “Further Exploration of the Role of the Sliding Varistor” was added, and teaching was conducted through demonstration experiments. The steps are as follows: (1) The teaching of the “reduction of the sliding rheostat” is performed. The power supply, light, key, ammeter, voltmeter, and sliding rheostat are connected as shown in Figure 1. Figure (A) is measured