隨著我們身(shen)邊的電(dian)子設備越(yue)來越(yue)多(duo)，各(ge)種(zhong)各(ge)樣(yang)(yang)的自然也是(shi)免不了(le)的，為了(le)充(chong)電(dian)方便，我們許(xu)多(duo)人(ren)都喜歡把電(dian)源(yuan)適(shi)配(pei)器一直插(cha)插(cha)座(zuo)，不過雖然沒(mei)連接上設備這(zhe)樣(yang)(yang)也是(shi)會(hui)慢慢耗電(dian)的，那么為什么電(dian)源(yuan)適(shi)配(pei)器空載也會(hui)耗電(dian)呢？

大多數電(dian)(dian)(dian)源(yuan)適配(pei)器(qi)都是(shi)屬于開關電(dian)(dian)(dian)源(yuan)，先(xian)把220V整流成直(zhi)流電(dian)(dian)(dian)，然(ran)(ran)后(hou)通過(guo)高頻變(bian)(bian)換，經過(guo)脈沖變(bian)(bian)壓(ya)器(qi)耦合，單向整流輸出低(di)壓(ya)直(zhi)流。即使沒有輸出電(dian)(dian)(dian)流，高頻變(bian)(bian)換部(bu)分仍然(ran)(ran)是(shi)在(zai)(zai)(zai)(zai)(zai)工(gong)作(zuo)的(de)(de)，需要消耗部(bu)分電(dian)(dian)(dian)能。例如充(chong)電(dian)(dian)(dian)器(qi)中的(de)(de)控(kong)(kong)制(zhi)電(dian)(dian)(dian)路，主要是(shi)感(gan)應設(she)備是(shi)否連接到(dao)電(dian)(dian)(dian)源(yuan)適配(pei)器(qi)上，在(zai)(zai)(zai)(zai)(zai)電(dian)(dian)(dian)源(yuan)適配(pei)器(qi)沒有連接到(dao)設(she)備上時，控(kong)(kong)制(zhi)電(dian)(dian)(dian)路也(ye)在(zai)(zai)(zai)(zai)(zai)工(gong)作(zuo)。再例如負載元(yuan)件(jian)（個別充(chong)電(dian)(dian)(dian)器(qi)的(de)(de)指示燈(deng)），在(zai)(zai)(zai)(zai)(zai)插在(zai)(zai)(zai)(zai)(zai)電(dian)(dian)(dian)源(yuan)上時也(ye)是(shi)在(zai)(zai)(zai)(zai)(zai)工(gong)作(zuo)的(de)(de)，也(ye)會消耗部(bu)分電(dian)(dian)(dian)能。總之(zhi)充(chong)電(dian)(dian)(dian)器(qi)一類的(de)(de)設(she)備在(zai)(zai)(zai)(zai)(zai)插在(zai)(zai)(zai)(zai)(zai)電(dian)(dian)(dian)源(yuan)上必然(ran)(ran)會消耗電(dian)(dian)(dian)能。

因為國家規定電(dian)(dian)(dian)(dian)源(yuan)適配器的(de)(de)額定輸出電(dian)(dian)(dian)(dian)流應(ying)在500毫安(an)至1500毫安(an)的(de)(de)范圍(wei)內(nei)，由制造商(shang)確定。在電(dian)(dian)(dian)(dian)源(yuan)適配器無負(fu)載能量消(xiao)耗下(xia)，功率消(xiao)耗小于(yu)150毫瓦(wa)。我(wo)們使(shi)用的(de)(de)正規的(de)(de)充電(dian)(dian)(dian)(dian)器基本都會符合國家的(de)(de)相關標(biao)準，所以消(xiao)耗的(de)(de)電(dian)(dian)(dian)(dian)量并不是很(hen)大。不過(guo)日積月(yue)累，以全(quan)國來算的(de)(de)話也是相當(dang)可觀了。