初中物理第二册196页的焦耳定律演示实验,在教学实践中,物理教师普遍感到困难过大:一是煤油受热膨胀率过小,液柱升高很慢,课堂演示太费时间;二是认读液柱高度不方便;三是部件过多,搬运和实验不方便。鉴于以上原因,我在教学实践中,反复试验和改进,做成了焦耳定律验证仪。 Joule’s law demonstration experiment in the second volume of the junior high school physics book 196, in the teaching practice, physics teachers generally feel that the difficulty is too great: First, the thermal expansion rate of kerosene is too small, the liquid column rises very slowly, the classroom demonstration is too time-consuming; Recognizing the height of the liquid column is inconvenient; third, there are too many parts, making handling and experimentation inconvenient. In view of the above reasons, I have tried and improved the teaching practice and made Joule’s Law Verifier.