论文部分内容阅读
电磁感应这部分教材(初中物理下册§61-§68)包括四部分。第一部分講述感生電流的產生、感生電流的方向和怎樣產生交流電。第二部分讲述交流發電机和直流發電機。第三部分讲述电能的输送和变太器。第四部分講述我国的電力化。 (一) 第一部分教材是关于电磁感应的基本知识,它所佔的地位非常重要。首先就是因為它是整個电学中的基礎知识;人類所以可能把機械能轉变为電能,從而獲得廉價的大量的電能來為人類服務,就是由於掌握和利用了這些知识。其次,講授這些知識將使学生在電学中更深刻地認識到能量轉變和守恆这一偉大的自然規律。再次,因為这些物理現象,對於初中学生来说是十分生疏的。在此以前,他們並沒有關於感生電流的感性知識。最後,因为它是發电机和變压器的基本原理,不理解它就无從講解發電机和變壓器。因此,我們必須着重講解
Electromagnetic induction of this part of the textbook (junior high school physics under the 61-§68) consists of four parts. The first part describes the generation of induced current, the direction of induced current and how to generate AC power. The second part deals with alternators and DC generators. The third part describes the transmission of energy and the change of device. The fourth part tells about the electrification of our country. (A) The first part of the textbook is the basic knowledge of electromagnetic induction, its position is very important. The first is because it is the basic knowledge of the whole electricity; human beings may therefore convert the mechanical energy into electrical energy, thus obtaining a cheap large amount of electrical energy to serve human beings, which is due to the mastery and utilization of the knowledge. Second, teaching this knowledge will enable students to be more deeply aware of the great laws of nature of energy transformation and conservation in electricity. Again, because of these physical phenomena, for junior high school students is very rusty. Until then, they did not have perceptual knowledge of induced currents. Finally, because it is the basic principle of generators and transformers, it is impossible to explain generators and transformers without understanding it. Therefore, we must focus on explaining