為什么家里電燈會突然變暗
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來源:金環宇電線發布日期(qi):2019-08-16 10:07
電(dian)燈是將電(dian)能(neng)(neng)轉化為光能(neng)(neng),以提供照明的設備。
其工(gong)作原理是:電(dian)流通過燈(deng)絲(si)(鎢絲(si),熔點達3000多攝氏度)時(shi)產生熱量,螺旋狀(zhuang)的(de)燈(deng)絲(si)不斷(duan)將熱量聚集,使得燈(deng)絲(si)的(de)溫度達2000攝氏度以(yi)上,燈(deng)絲(si)在處于(yu)白熾狀(zhuang)態(tai)時(shi),就象燒紅(hong)了的(de)鐵(tie)能發光一樣而發出(chu)光來。燈(deng)絲(si)的(de)溫度越高,發出(chu)的(de)光就越亮。故(gu)稱(cheng)之為白熾燈(deng)。
從能(neng)(neng)量的轉換角度看,電燈(deng)發光(guang)(guang)時,大量的電能(neng)(neng)將轉化為(wei)熱能(neng)(neng),只有極少一(yi)部分可以轉化為(wei)有用的光(guang)(guang)能(neng)(neng)。
電(dian)燈時(shi)亮時(shi)暗(an)是因為電(dian)流(liu)的原(yuan)因:
出現電燈突(tu)然變暗(an)的情況多數是出現在夏(xia)季,夏(xia)季天(tian)太熱,用電量非常大。
出現此類情況怎么辦?檢查線路(lu)、電(dian)壓(ya)、大(da)功率用(yong)電(dian)設備。如果線路(lu)沒(mei)有問題,那(nei)很大(da)的(de)可能性就是電(dian)壓(ya)不(bu)穩的(de)問題了。
用電(dian)(dian)(dian)(dian)高峰時(shi)開燈,由于負(fu)載(zai)增多(duo),總(zong)電(dian)(dian)(dian)(dian)阻減小,根據歐姆定律,輸(shu)電(dian)(dian)(dian)(dian)線上的(de)電(dian)(dian)(dian)(dian)流增大(da),輸(shu)電(dian)(dian)(dian)(dian)線上損(sun)失的(de)電(dian)(dian)(dian)(dian)能變(bian)大(da),則家(jia)庭(ting)電(dian)(dian)(dian)(dian)路兩端電(dian)(dian)(dian)(dian)壓(ya)比(bi)較低(di),燈泡的(de)實(shi)際(ji)功率小,因(yin)此比(bi)較暗(an).而深夜時(shi),用電(dian)(dian)(dian)(dian)的(de)用戶較少,干路上的(de)電(dian)(dian)(dian)(dian)流小,線路上損(sun)耗的(de)電(dian)(dian)(dian)(dian)能較小,則家(jia)庭(ting)電(dian)(dian)(dian)(dian)路兩端電(dian)(dian)(dian)(dian)壓(ya)相對(dui)于用電(dian)(dian)(dian)(dian)高峰時(shi)的(de)電(dian)(dian)(dian)(dian)壓(ya)大(da),燈泡的(de)實(shi)際(ji)功率大(da),因(yin)此比(bi)較亮。或(huo)者(zhe)說(shuo)用電(dian)(dian)(dian)(dian)高峰期,電(dian)(dian)(dian)(dian)網負(fu)荷(he)過(guo)大(da),你家(jia)的(de)電(dian)(dian)(dian)(dian)壓(ya)值變(bian)小(國(guo)家(jia)電(dian)(dian)(dian)(dian)網220V),你家(jia)的(de)電(dian)(dian)(dian)(dian)壓(ya)過(guo)低(di),有可能180V或(huo)者(zhe)150V甚(shen)至是110V,也(ye)就帶不動燈,造成(cheng)燈具一閃一閃或(huo)者(zhe)是變(bian)紅變(bian)暗(an)。
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