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灯泡通电后为什么会发亮
更新时间: 2020-07-13 00:00:00  

灯泡里面的灯丝是钨丝,其主要成分是钨。当钨丝通电时,由于钨丝的电阻式电能转化成内能,将钨丝加热,所以温度升高。一般金属加热到一定程度后就会发光,这个现象称为白炽状态,通电时灯丝温度达到白炽状态,灯泡就会发亮。

关键词: 灯泡 通电 为什么 发亮

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