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九年级总复习不能是简单地重复,必须找好的切入点,找准题材,围绕题材把知识点串起来,从而达到巩固知识,升华能力的目的.电学复习我是通过“灯泡”为题串起来复习的.组织如下:1.小灯泡中有电流的条件是什么?考查电路问题.(通路,有电源)2.小灯泡中电流方向与自由电子方向的关系是怎样的?考查电流方向的规定.(相反)3.白炽灯泡的灯丝用什么样的材料做成的?考查电阻知识.(电阻率较大,熔点高的钨丝)
The ninth grade general review can not be simply repeated, we must find a good entry point, identify the subject, around the theme of knowledge points string up, so as to achieve the purpose of consolidating knowledge, sublimation capabilities. Problem string string review. Organized as follows: 1. What are the conditions for the current in the small light bulb? Check the circuit problems (access, power supply) 2. What is the relationship between the current direction of the small bulb and the free electron direction? (Opposite) 3. What kind of material is used for the incandescent bulb filament? Check resistance knowledge (tungsten filament with high resistivity and high melting point)