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安全用电的知识是现代公民必须具备的知识。初中物理教材中有专题讨论,高等师范院校物理专业电工学课程中也把它列入必修部分。但教材、教参中有关内容在理论和指导实践方面存在着一些不清楚甚至错误的地方。这将引起教学过程中的困惑和错误,必须予以澄清。下面就此做几点讨论。1 关于保护方式的问题初中物理课本中强调,电器的金属外壳一定要接地,接地后“即使外壳带电,也会从接地导线流走,人体接触外壳就没有危险了”。教师用书中还
Knowledge of safe electricity is a must for modern citizens. There is a topic discussion in junior high school physics textbooks, which is also included in the compulsory part of the electrotechnics course of physics major of higher normal university. However, there are some unclear and even wrong places in the teaching and teaching contents in theory and practice. This will cause confusion and mistakes in the teaching process and must be clarified. Here to do some discussion. 1 on the protection of the problem Middle School Physics textbook stressed that the electrical metal shell must be grounded, grounding “even if the shell is live, it will flow away from the ground wire, the human body contact with the shell there is no danger.” Teacher’s book also