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为什么电灯泡会发光?

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为什么电灯泡会发光?

电灯泡的灯丝是用细钨丝绕成的,呈螺旋状。一般钨丝加热到100°C时就开始发光。而钨丝能耐受2300°C - 2500°C高热。在玻璃制成的电灯泡里, chou走空气,装入氮、氩等不燃烧气ti,然后密封起来,这就成了电灯泡。当电liu从电线里liu进灯丝(钨丝)里时,由于灯丝的电阻相当大,就产生了高热,热到一定程度就发起光来。电灯泡就是"因热而发光"的,因此发光的电灯泡非常tang,所以千万不要用手chu2摸。

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