初中物理第二册,在“有用的电子元件”一章中讲到利用光敏元件可制成控制电路,特别强调了它的应用,在教学中为了降低知识难度,便于学生理解,又有利于培养他们的科技意识,为此我把过去制作的利用继电器实现大门开、关的远距离操纵和自动控制演示器,进一步改制成光控大门演示器。现介绍如下。 In the second volume of junior high school physics, the “Useful electronic components” chapter discusses the use of photosensors to make control circuits, with special emphasis on its application. In order to reduce the difficulty of knowledge in teaching, it is easy for students to understand, but also conducive to training. Their scientific and technological consciousness, for this reason, I have used the relay to open and close the remote control and automatic control demonstrator made by the past and further modified it into a light control door demonstrator. The introduction is as follows.