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初中物理安全用电部分,因教学仪器缺乏,给教学和学习带来一定困难.针对这一情况,我们研制了跨步电压演示器.通过教学实践,觉得这一教具不仅效果显明,有利于解决教学中的难点,而且易于取材和制做.特介绍于下,以供参考.如图1,2所示.用木板或其他材料制成底座.用铁片或自行车条焊成高压线铁塔模型并固定在底座上.由落地线与底座的相接处引出导线接电池与开关.根据底座的大小,制一金属环(直径以30cm为宜).以落地线处为圆心,将金属环固定在底座上并由金属环引出导线也与电池组(6V—9V)、开关相接(为美观起见、电池组可装在底座的下面).探测器可用万用表表笔代替,也可用两根金属棒外套绝缘皮制成.探测器的
The part of junior high school physics security, due to the lack of teaching equipment, teaching and learning to bring some difficulties. In view of this situation, we have developed a step-by-step voltage demonstrator. Through teaching practice, I feel that this teaching aid is not only effective, is conducive to solving Difficulty in teaching, and easy to draw and make. Specially introduced in the following, for reference. As shown in Figure 1,2. Made of wood or other materials to the base. Iron plate or bicycle strip welded to the high voltage wire tower model and Fix on the base. From the junction between the grounding wire and the base, lead the wire to the battery and the switch. According to the size of the base, make a metal ring (30cm in diameter is appropriate). Fix the metal ring at the center of the floor wire. The lead wire on the base and led by the metal ring is also connected to the battery pack (6V-9V) and the switch (for the sake of beauty, the battery pack can be installed under the base). The detector can be replaced with a multimeter pen, or two metal rod coats can also be used. Made of insulating skin.