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在中等学校的物理教学中,电源的电动势、内电阻以及电源的最大输出功率是三个重点内容。为了使学生能深入掌握这三方面的概念,教材中除了进行详细的分析、讨论之外,还安排有二个学生分组实验。图1、图2即两个实验的原理图。这两个实验都是通过改变R得到许多组R、I的数据,然后在P—R坐标和V—I坐标中通过描点,画出对应的曲线,然后再来分析、计算实验结果的。由于要测的数据较多,还要经过计算、描点、作图等步骤,因此一般学生要用几个小时才能完成。目前微机正在我国中等学校里逐步应用和推广,而常见的APPLE-Ⅱ微机有较强的作图功能。因此,我们作了一次尝试,将上述两个实验合并,一次测定数
In the teaching of physics in secondary schools, the power source’s electromotive force, internal resistance, and the maximum output power of the power supply are three key elements. In order to enable students to have an in-depth understanding of these three concepts, in addition to detailed analysis and discussion, the textbook also has two student grouping experiments. Figure 1 and Figure 2 are schematic diagrams of two experiments. Both of these two experiments are to obtain R, I data of many groups by changing R, then draw the corresponding curve in the P-R coordinates and V-I coordinates by drawing points, and then analyze and calculate the experimental results. Due to the large amount of data to be measured, it is also necessary to go through calculations, sketching, drawing, and other steps. Therefore, it usually takes a few hours for students to complete. Microcomputers are currently being gradually applied and promoted in secondary schools in China, and common APPLE-II microcomputers have strong mapping capabilities. Therefore, we made an attempt to combine the above two experiments to determine the number of