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师:今天,老师很高兴和同学们一起学习一节非常有趣的科学课。我们以前已经学习过有关电路的知识,谁能说一说一个基本电路由哪几部分组成?你又是怎样让小灯泡发光的?生:一个基本电路中有电池、导线、开关,还有小灯泡。我把这些都连接好后,合上开关,形成一个闭合回路,小灯泡就发光了。师:(出示一个电路)老师这儿也有一个电路,如果我把开关合上,电路接通后,小灯泡会不会亮?生:会亮。
Teacher: Today, the teacher is happy to learn a very interesting science class with his classmates. We have previously learned about the circuit, who can say a few parts of a basic circuit? How do you make a small light bulb? Health: a basic circuit with batteries, wires, switches, as well as small light bulb. After I connected all of them, I closed the switch to form a closed circuit and the small light bulb glowed. Teacher: (Show a circuit) The teacher here also has a circuit, if I turn the switch off, the circuit is connected, the small light bulb will not light? Health: will light.