This lesson explores the structure and working principles of batteries through experiments. The students are engaged to learn once they realize the importance of batteries in daily life. Students will understand the structure and working principles of batteries through this lesson and perhaps will want to develop better batteries in the future! Prior to using this lesson, a teacher may want to ask students to obtain some knowledge about batteries on their own.There are several experiments for the students to conduct in this lesson. Some fruits such as lemons, tomatoes, apples will be used for the experiments. Other materials such as wires, a galvanometer, and a small bulb also need to be prepared. The experiments take some time. To save time, the students can be divided into several groups with 3-5 students doing different experiments. Afterwards, the different groups can share and discuss their findings. By conducting the experiements this way, the lesson can be done in about 45 minutes. Students should be encouraged to perform the experiments in a focussed and ordered manner. For example, while exploring the conditions to form a primary cell, they should always keep one condition the same and change other conditions alternately. 

这是一节探究电池的构成和放电原理的实验探究课。用电池在生活中的重要作用来激发学生们的学习兴趣。希望通过今天的学习，学生能够在了解电池的构成和放电原理的基础上，更好的发展电池，更好的为人类服务！在上本节课之前，可以要求学生们提前了解一些现在常用电池的类型及简单的放电原理。

 这节课的探究实验比较多，需要生活中的各种水果，如柠檬、番茄、苹果等，还需要导线，电流计，小灯泡以及一些电解质溶液。由于需要学生亲自动手实验，再从实验现象得出结论，所以耗时较长，建议学生们可以分组实验，然后相互交流现象，这样可以节约时间，大概45分钟左右就够了。

在动手实验时，可以分成3-5人一组，注意实验的目的，有序性。比如在探究原电池构成条件时，要求 “一变它定” ，即探究某一条件的影响，其他条件就不能变；每个探究实验在上一个实验的基础上稍作改进就可以进行，这样可以节约时间。