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在华师大版的科学教材中设计有“电源短路的危害”“电路过载的危害”演示实验,让学生通过观察、分析实验现象知道电源短路、电路过载的危险性。但在演示这两个实验的过程中发现:其在可视性、安全性、可重复性、操作性等方面有所不足。针对实验中出现的这些问题,经过反复探究和验证,改进后的实验现象明显、安全、操作简单等使学生对电源短路有了更深刻的感受,从而触发其养成在连接电路时进行仔细检查的好习惯,以防电源短路与电路过载,在教学中收到较好的效果。
In the textbook of China Normal University, there are “demonstration of the hazards of power short circuit” and “the hazards of circuit overload” so that students can know the dangers of short circuit and overloaded circuit by observing and analyzing the experimental phenomena. However, during the demonstration of these two experiments, they found that they lacked in terms of visibility, safety, repeatability and operability. In view of these problems in the experiment, after repeated exploration and verification, the improved experimental phenomenon is obvious, safe and easy to operate, so that students have a deeper feeling of short circuit to the power, which triggers the development of the circuit to be carefully examined when connected Good habits to prevent the power supply short circuit and circuit overload, received good results in teaching.