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初中物理第二册第四章介绍了电路的几种连接状态—通路、开路、短路.并通过图解方法引导学生认识“短路”会造成对电源的损坏.教材第五章“电流表使用”一节特别强调“不允许不通过用电器直接把电流表接到电源上.第十章分析电流过大原因时又强调原因之一是”短路“.此时发生短路会造成电线烧坏引起火灾.教材以上安排采用循序渐进,由浅入深的方法把”短路“的危害介绍给学生,使学生最终理解这一知识点.但实际教学中要培养学生运用
The fourth chapter of the second book of junior high school physics introduces several connection states of the circuit—pathways, open circuits, and short circuits. It also guides students through graphical methods to recognize that “short circuit” can cause damage to the power supply. ”A section of special emphasis“ does not allow the use of electrical appliances directly to the power meter is not allowed to connect to the power supply. Chapter ten analysis of the cause of excessive current, but also stressed that one of the reasons is ”short circuit ". At this time a short circuit will cause the wire Burning causes fire. The above teaching materials use gradual and gradual methods to introduce students to the hazards of “short-circuiting”, so that students can finally understand this knowledge point. However, students should be trained in practical teaching.