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关于电灯灯丝断了,搭起来,为什么会更亮些? 关于这个问题,目前有以下两种解释: 解释之一:灯丝断了,搭起来,此时灯丝变短了,加粗了,于是灯丝电阻减小,因而,通过的电流较多,根据焦耳——楞次定律所以产生的热量亦多,故更亮. 解释之二:灯丝断了搭起来,因搭头处不紧密,因而电阻大,根据焦耳——楞次定律产生的热多,故较亮. 看起来这两种解释都有理由,其实解释之一理由较充分,而解释二欠妥,这是因为:
Regarding the lamp filament breaks, take it up, why would it be brighter? There are currently two explanations for this problem: One explanation: The filament is broken and put up, and the filament becomes shorter and thicker, so the filament The resistance decreases. Therefore, there are many currents passing through. According to Joule-Leng’s Law, the amount of heat generated is also greater. Therefore, it is brighter. Explained two: The filament is broken, and the resistance is great because the tip is not tight. , According to Joule - Lenz’s law produces more heat, it is brighter. It seems that these two explanations are justified. In fact, one of the explanations is more plausible, while the second interpretation is not right. This is because: