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进行正确的全电路计算对学生来讲是比较困难的,因此,关于全电路计算的教学成为物理课的难点之一,现就这一问题谈几点看法。(一)分析题意。一个题目拿来,教师应首先引导学生反复研究题目的意思,据题意画出一个简图来,并把题目中的未知量,已知量准确地标在图中的相应位置,这样画出的简单的电路图以便成为学生建立逻辑思维的线索。画时尽力接近常见的形式.(二)解题的关键在于找出解决这一问题的基本出发点。答题中涉及到电动势ε、由电阻γ、内电路、外电路等概念,则断言解决这一问题的基本出发点是全电路欧姆定律:
It is difficult for the students to carry on the correct full circuit calculation. Therefore, the teaching of full circuit calculation becomes one of the difficulties in the physics class. Now I will talk about this issue. (A) Analysis of the problem. A subject is used, teachers should first guide students to repeatedly study the meaning of the subject, according to the idea of drawing a sketch, and the title of the unknown, the amount of known accurately marked in the corresponding position in the map, so drawn Simple circuit diagram in order to become a clue to students to establish logical thinking. When painting, try to get close to the common form. (2) The crux of the problem lies in finding out the basic starting point for solving this problem. The answer involves the electromotive force ε, by the resistance γ, the internal circuit, external circuits and other concepts, then the assertion to solve this problem is the basic starting point Ohm’s law of the whole circuit: