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笔者最近用白炽灯泡制做的焦耳定律演示器,材料易取、造价低廉、灵敏度高、可见度大、操作简便、实用效果好。1、设计思想。教材中介绍的焦耳定律演示装置是用烧瓶内装电阻丝注满染了色的煤油,通电时,煤油受热膨胀、插在烧瓶口胶塞上的细玻璃管内的液柱上升,由液柱升高的程度来表明电流产生的热量跟电阻、电流强度、通电时间的定量关系。因烧瓶较贵,为降低制做成
I recently used the Joule law demonstrator made of incandescent light bulbs. The material is easy to take, the cost is low, the sensitivity is high, the visibility is large, the operation is simple, and the practical effect is good. 1, design ideas. The Joule law demonstration device described in the textbook is filled with dyed kerosene filled with resistance wire inside the flask. When the electricity is turned on, the kerosene is heated to expand, the liquid column in the thin glass tube inserted into the flask’s rubber plug rises, and the liquid column rises. The degree indicates the quantitative relationship between the amount of heat generated by the current and the resistance, current intensity, and on-time. Because the flask is more expensive, it is made to reduce