论文部分内容阅读
焦耳定律是人民教育出版社《物理》(以下简称新教材)九年级全一册第十八章第四节内容,是初中物理学习的重要定律之一,是能量守恒定律在电能与内能之间转化的具体体现。教材在电功、电功率之后安排焦耳定律,符合学生的认知规律。本节内容研究了电热与电阻、电流、通电时间的定性关系,对焦耳定律的理解及应用既是教学的重点又是教学的难点。做好实验和观察实验现象及分析得出实验
Joule’s law is one of the important laws of junior high school physics learning, which is the fourth chapter of Chapter 18 of the ninth grade of People’s Education Press, Physics (hereinafter referred to as the new textbook). It is the law of conservation of energy between electric energy and internal energy The specific embodiment of the conversion. Teaching materials in the electric and electrical power arrangements Joule law, in line with the cognitive rules of students. In this section, we study the qualitative relationship between electric heat, resistance, current and power-on time. Understanding and applying joule’s law is not only the focus of teaching but also the difficult point of teaching. Do a good job of experimenting and observing the experimental phenomena and analyzing the experiment