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初中电学基本公式就是四个,但是公式之间的变形较多,在实际的解题过程中,需要学生合理地选择正确的公式。为了让学生充分掌握本单元内容,结合课程标准,笔者对电学知识的重点、难点进行分析。一、课标解读学习本单元,学生要:(1)理解11个概念:电荷量、电流、电压、电阻、电功、电功率、额定电压、额定功率、实际电压、实际功率、焦耳定律。(2)熟记两个定律:欧姆定律:导体中的电流,跟导体两端的电压成正比,跟导体的电阻成反比。焦耳定律:电流通过导体产生的热量跟电流的二次方成正比,跟导体的电阻成正比,跟通电时间成
The basic formula of junior high school is four, but the deformation between the formulas is more. In the process of solving problems, students need to choose the correct formula properly. In order to allow students to fully grasp the content of this unit, combined with curriculum standards, the author of the electric knowledge of the key and difficult to analyze. First, the standard interpretation of learning this module, students should: (1) to understand the 11 concepts: charge, current, voltage, resistance, electrical power, electrical power, rated voltage, rated power, actual voltage, real power, Joule’s law. (2) Learn two laws: Ohm’s law: the current in a conductor, proportional to the voltage across the conductor, is inversely proportional to the resistance of the conductor. Joule’s law: the heat generated by the current through the conductor is proportional to the square of the current, proportional to the resistance of the conductor, with the power on time into