同樣標(biao)稱(cheng)電(dian)(dian)(dian)(dian)(dian)壓的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)源，輸(shu)出(chu)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)不(bu)(bu)同，能(neng)不(bu)(bu)能(neng)用在(zai)同一臺筆(bi)記(ji)本(ben)上(shang)(shang)。基本(ben)的(de)(de)(de)(de)(de)原則是大(da)標(biao)稱(cheng)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)源可以代(dai)替小標(biao)稱(cheng)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)源。有些(xie)(xie)朋友有誤解，覺得(de)大(da)標(biao)稱(cheng)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)源會燒(shao)壞筆(bi)記(ji)本(ben)，因為電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)大(da)了嘛。實際上(shang)(shang)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)多(duo)大(da)在(zai)電(dian)(dian)(dian)(dian)(dian)壓相同的(de)(de)(de)(de)(de)情(qing)況下取決(jue)于負載(zai)，也就(jiu)是筆(bi)記(ji)本(ben)的(de)(de)(de)(de)(de)工作情(qing)況，當筆(bi)記(ji)本(ben)高(gao)負荷(he)運轉(zhuan)的(de)(de)(de)(de)(de)時候，電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)大(da)些(xie)(xie)，筆(bi)記(ji)本(ben)進入待機的(de)(de)(de)(de)(de)時候，電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)就(jiu)小些(xie)(xie)，總之電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)等于加在(zai)筆(bi)記(ji)本(ben)上(shang)(shang)的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)壓除以筆(bi)記(ji)本(ben)的(de)(de)(de)(de)(de)等效電(dian)(dian)(dian)(dian)(dian)阻。

大標(biao)稱電(dian)(dian)流(liu)的(de)(de)電(dian)(dian)源(yuan)(yuan)有足夠的(de)(de)電(dian)(dian)流(liu)余(yu)量，不會(hui)在代替(ti)小標(biao)稱電(dian)(dian)流(liu)電(dian)(dian)源(yuan)(yuan)之后發生過(guo)熱或(huo)者輸出電(dian)(dian)壓過(guo)低的(de)(de)情況。反之，用(yong)小電(dian)(dian)流(liu)電(dian)(dian)源(yuan)(yuan)代替(ti)大電(dian)(dian)流(liu)電(dian)(dian)源(yuan)(yuan)就存在上述危險。但是(shi)有的(de)(de)朋友用(yong)58w的(de)(de)電(dian)(dian)源(yuan)(yuan)代替(ti)73w的(de)(de)用(yong)起來(lai)也沒什么(me)問題，原因(yin)是(shi)通(tong)常的設計留有一(yi)定的余(yu)量，負載功(gong)率(lv)都要小于電源功(gong)率(lv)，所(suo)以這(zhe)種代(dai)替在一(yi)般(ban)使用上是可行(xing)的，但是剩余(yu)的電源功(gong)率(lv)余(yu)量就很少(shao)了。

一(yi)旦筆記本(ben)接了(le)很多外設，比(bi)(bi)如兩塊(kuai)USB硬盤，然后CPU全(quan)(quan)速(su)運轉，再有一(yi)個(ge)底(di)座(zuo)，上面(mian)來個(ge)光驅(qu)全(quan)(quan)速(su)讀盤，再加上同時(shi)給電(dian)池充電(dian)就(jiu)危(wei)險了(le)，要隨時(shi)用(yong)手摸摸你的電(dian)源是不(bu)是已經(jing)可(ke)以(yi)煮雞蛋(dan)了(le)。72w比(bi)(bi)56w適(shi)配器多出的16w就(jiu)是應付這(zhe)種情(qing)況的。所以(yi)最好不(bu)要用(yong)小電(dian)流電(dian)源代(dai)替大電(dian)流電(dian)源。

 這里飛天鷹建議大(da)(da)(da)家，如果要以小(xiao)替大(da)(da)(da)，那(nei)么就(jiu)在有條件時對筆(bi)記本的(de)最大(da)(da)(da)消耗實際需(xu)要電流進行測(ce)試。只需(xu)要插(cha)(cha)座、插(cha)(cha)頭、電流表、導線、烙鐵這幾樣簡單的(de)東西就(jiu)能完成(cheng)測(ce)試，當然，如果測(ce)試的(de)結果顯示在電源(yuan)適配器標稱電流之內，那(nei)么就(jiu)是安(an)全的(de)。