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现行初中《物理》第二册第九章第四节中(人教社版),用第196页图9—5的装置,定性演示焦耳定律,实验时需要煤油,而煤油膨胀在玻璃管中上升的现象区分度不够大。因此,我对此实验装置作了如下改进。结构说明:A、B、C是三段“4B”铅笔芯。A、C等长(8～10厘米),B长为A长的一半。用多股铜丝芯导线按上图将它们缠接紧(用小刀把铅笔芯两端刻出一圈小槽,导线缠接在槽内),固定于有底座的竖直木板上,用
In the fourth chapter of the current junior middle school “Physics” (Chapter 9) (Preacher and Community Edition), the apparatus of Fig. 9-5 on page 196 qualitatively demonstrates Joule’s law, kerosene is needed for the experiment, and kerosene expands in the glass tube. The rising phenomenon is not sufficiently differentiated. Therefore, I made the following improvements to this experimental device. Structure Description: A, B, C are three “4B” pencil lead. A, C, etc. (8 to 10 cm), B is half the length of A. Using multi-stranded copper wire conductors, sew them tightly (using a small knife to engrave the ends of the pencil core with a small groove and the wire is wound in the groove) and fix it on a vertical board with a base.