1教材分析活动目的通过活动,让学生了解“调光灯”的“WWW”?【what,how,why?物理意义】重点、难点剖析1.1设计简单电路的步骤和注意事项(1)明确目的要求(为了解决什么问题而设计电路);(2)根据目的要求和所给条件设计电路;(3)运用学过的知识,对设计的电路进行讨论,说明这个电路能否解决问题;拟定实验步骤,进行实验验证.1.2对于一个实际问题,解决的方案往往不止一个,对设计方案应注意比较是否简单、易行,有无隐患等. 1 textbook analysis activities Objectives Through activities, so that students understand “dimming lamp ” “WWW ”? [What, how, why? Physical meaning] focus, difficult analysis 1.1 steps and precautions to design a simple circuit (1 ) Clear purpose requirements (in order to solve the problem of the circuit design); (2) according to the purpose of the requirements and given the design of the circuit conditions; (3) the use of knowledge learned on the design of the circuit to discuss whether this circuit can solve the problem ; The preparation of experimental steps, experimental verification.1.2 For a practical problem, often more than one solution to the design should pay attention to whether the comparison is simple, easy, with or without hidden dangers.