焦耳定律是电学中的一个重要定律,研究焦耳定律的实验是探索性实验,而做好这个实验是得出焦耳定律的关键.为了突破这个难点,我设计制作了一套定量研究焦耳定律的仪器.该仪器制作简单,精度高,演示时间短,一般在40秒内即可完成,配合投影演示,可见度大大提高.现介绍如下:一、研究电流通过导体放出的热量与导体电阻之间的关系 Joule’s law is an important law in electricity. The experiment to study Joule’s law is an exploratory experiment. To do this experiment is the key to Joule’s law. To overcome this difficulty, I designed and manufactured an instrument to quantitatively study Joule’s law. The instrument is simple to produce, high precision, short demonstration time, generally completed in 40 seconds, with the projection demonstration, visibility is greatly improved. Now is introduced as follows: First, the relationship between the heat emitted by the current through the conductor and the resistance of the conductor is studied.