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中师物理《电流和电路》的教学中,电路中各个物理量的计算是一个难点.难就难在学生往往分不清复杂电路中各个部分之间的串、并联关系.为此,教师在教好电流强度、电压、电阻概念、欧姆定律以及串联电路和并联电路的特点等基础知识的前提下,要教给学生掌握分析电路的方法.因为,只有弄清楚电路中各个用电器的连接情况,才能正确运用欧姆定律解决电路中各物理量的计算问题.在教学中我采用追踪分析的方法,即跟电路中的电流从电源正极流出、沿电路而流入电源负极之
In the teaching of “current and circuit” in the physics division of the normal division, the calculation of each physical quantity in the circuit is a difficult point. It is difficult to be difficult for students to distinguish the serial and parallel relationship between the various parts of a complex circuit. For this reason, teachers are teaching. Under the premise of good current strength, voltage and resistance concepts, Ohm’s law, and characteristics of series circuits and parallel circuits, students should be taught how to analyze the circuit. Only the connection of each electrical device in the circuit can be known. Ohm’s law can be used correctly to solve the problem of calculating the physical quantity in the circuit. In the teaching, I use the method of tracking analysis, that is, the current in the circuit flows from the positive electrode of the power supply and flows along the circuit to the negative electrode of the power supply.