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初中《物理》第二册第196页图9-5是演示焦耳定律的常用装置图。这个实验方法存在如下缺点:1.煤油气味难闻,2.实验所用时间较长,3.煤油升上去后,不能很快复原,不便于进行下一步实验并影响连续上课。所以一般很难按正常教学进度完成这个演示实验。我在讲课时,改用如下装置演示焦耳定律,克服了以上缺点,
Figure 9-5 of the second edition of the book “Physics” in the junior high school is a common device diagram for demonstrating Joule’s law. This experimental method has the following disadvantages: 1. The smell of kerosene is unpleasant, 2. The experiment takes a long time, 3. After the kerosene rises, it cannot recover quickly, and it is inconvenient to carry out the next experiment and affect continuous class. Therefore, it is generally difficult to complete this demonstration experiment according to the normal teaching progress. When I lectured, I used the following device to demonstrate Joule’s law and overcome the above shortcomings.