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在研究电流产生的热量与那些因素有关时,初中教材中介绍了如下演示实验。如图1所示的实验(内容详按此装置实验,我在教学中发现,实际演示起来所花的时间较长,同时效果也不明显。因为实验时用电池做电源,电流通过导体时放出的热量少,而煤油的比热较大、体胀系数又较小。故现象不显著,学生不易观察。
When studying the heat generated by currents and those factors, junior high school textbooks introduce the following demonstration experiments. As shown in the experiment shown in Figure 1, the content of this experiment is based on this device. I found in the teaching that the actual demonstration takes a long time and the effect is not obvious. Because the battery is used for the experiment, the current is discharged when the current passes through the conductor. The amount of calories is small, and the specific heat of kerosene is larger and the coefficient of body expansion is smaller. Therefore, the phenomenon is not significant and it is not easy for students to observe.