iPad充電器給iPhone充電：安(an)全

iPhone充(chong)電器給iPad充(chong)電：難說(shuo)

iPhone充電(dian)器給iPhone充電(dian)（完(wan)全(quan)放電(dian)）

iPad充(chong)電(dian)器(qi)給iPhone4s充(chong)電(dian)（完全放(fang)電(dian)）

在蘋果官網的技(ji)術支持區里有這(zhe)樣一(yi)段(duan)說明：iPad USB電源適配器(qi)是一(yi)個10W的充電器(qi)。雖然(ran)此iPad 10W USB電源適配器(qi)設計為供iPad使用，但(dan)是您(nin)仍可通過(guo)其對所有iPhone和iPod機型充電。

但(dan)對 “果粉(fen)”來(lai)說，有條微博讓人很糾結：請不要用iPad的充(chong)(chong)電(dian)器為iPhone充(chong)(chong)電(dian)，雖然(ran)它們看起(qi)來(lai)長得一樣，兩者的充(chong)(chong)電(dian)電(dian)壓也都是(shi)(shi)5V，但(dan)是(shi)(shi)iPhone充(chong)(chong)電(dian)的額定電(dian)流是(shi)(shi)1A，而iPad卻(que)是(shi)(shi)2.1A……混(hun)用充(chong)(chong)電(dian)器的后果是(shi)(shi)既傷(shang)iPhone又傷(shang)iPad充(chong)(chong)電(dian)器”。

iPad和iPhone充(chong)電器到底(di)能(neng)不能(neng)混(hun)用？口說無憑，實(shi)驗為證，《好奇實(shi)驗室(shi)》為你實(shi)測。

實驗對(dui)象：兩臺(tai)(tai)iPad、一臺(tai)(tai)iPad2、一臺(tai)(tai)iPhone4、一臺(tai)(tai)iPhone4s

中國計量學院(yuan)機電(dian)工程學院(yuan)的(de)蔡慧(hui)老師說，iPad充電(dian)器的(de)功率10W，是指(zhi)電(dian)源的(de)最大輸(shu)出(chu)功率，但(dan)實際輸(shu)出(chu)功率要取決于所接的(de)負載；iPad和iPhone的(de)充電(dian)器的(de)額(e)定電(dian)壓(ya)都(dou)是5V，只要實際電(dian)流不超過額(e)定電(dian)流（即iPhone1A，iPad2.1A），也不會對充電(dian)設備造成傷害(hai)。

iPad和(he)iPhone的充電(dian)(dian)(dian)器連(lian)接線(xian)(xian)都是一樣的，我們(men)把它剪斷，里面有紅黑白綠四條(tiao)線(xian)(xian)，經檢(jian)測(ce)，紅線(xian)(xian)是電(dian)(dian)(dian)源線(xian)(xian)，黑線(xian)(xian)是地線(xian)(xian)，當(dang)連(lian)接線(xian)(xian)和(he)iPad充電(dian)(dian)(dian)器相連(lian)時(shi)，在白線(xian)(xian)和(he)綠線(xian)(xian)上(shang)分別檢(jian)測(ce)到(dao)(dao)了2V和(he)2.7V電(dian)(dian)(dian)壓，而當(dang)連(lian)接線(xian)(xian)和(he)iPhone充電(dian)(dian)(dian)器連(lian)接時(shi)，白、綠兩條(tiao)線(xian)(xian)上(shang)沒有測(ce)到(dao)(dao)電(dian)(dian)(dian)壓。

“白(bai)、綠兩(liang)條線是(shi)信號線，當iPad或iPhone接上充電器(qi)(qi)時，通過這兩(liang)條線可以區分當前使(shi)用的是(shi)哪種充電器(qi)(qi)，能對(dui)負載做(zuo)出相應(ying)的調整。”蔡慧老師說。

我們先用萬能表對各種(zhong)充(chong)電(dian)方式進行檢測(ce)。

iPad充電器(qi)（單位：A） iPhone充電器(qi)（單位：A）

50%電量的iPadA 1.5 0.48

60%電量的iPadB 1.5 1.26

70%電量(liang)的iPad2 1.4 0.48

39%電量的iPhone4 0.98 0.45

40%電量的iPhone4s 0.88 0.9

從(cong)檢測結果看(kan)，iPad充(chong)(chong)(chong)電(dian)(dian)器給iPhone充(chong)(chong)(chong)電(dian)(dian)時，實(shi)際電(dian)(dian)流(liu)都低于1A，而用iPhone充(chong)(chong)(chong)電(dian)(dian)器給iPad充(chong)(chong)(chong)電(dian)(dian)時，iPadA和iPad2顯(xian)示(shi)“沒有充(chong)(chong)(chong)電(dian)(dian)”，顯(xian)示(shi)“正在(zai)充(chong)(chong)(chong)電(dian)(dian)”字(zi)樣(yang)的(de)iPadB的(de)實(shi)際電(dian)(dian)流(liu)偏大(da)，超過(guo)了(le)1A。

“iPadB里的一些系統軟件(jian)可能被更改了，導致這樣的問(wen)題出現，用iPhone充(chong)電(dian)(dian)器充(chong)電(dian)(dian)時，iPad是(shi)不會(hui)有(you)損傷(shang)的，因為電(dian)(dian)流小于額定電(dian)(dian)流，但(dan)對充(chong)電(dian)(dian)器會(hui)有(you)損傷(shang)，時間(jian)一長，充(chong)電(dian)(dian)器就(jiu)會(hui)壞掉。”

我們(men)注(zhu)意到，不(bu)同(tong)電量的設備，充電的實(shi)際電流大小也是不(bu)一樣的，蔡老師(shi)解釋說，這是因為智能電池在充電過(guo)程(cheng)中，為了保持電池不(bu)受傷害，所以電流的大小是會發生改變的。

為更詳(xiang)細地了(le)解整個(ge)充(chong)電(dian)(dian)過程，我(wo)們決定把iPad和iPhone完全放電(dian)(dian)到(dao)0%后(hou)，再進(jin)行充(chong)電(dian)(dian)，并用萬(wan)能表連接電(dian)(dian)腦來記錄整個(ge)充(chong)電(dian)(dian)過程――由于(yu)時(shi)間關系，我(wo)們選擇了(le)iPad2和iPhoe4s來進(jin)行實(shi)驗。

時間 實際電流（單位：A）

iPhone4s充(chong)電(dian)器充(chong)iPhone4s 約4小(xiao)時(shi) 0.8以(yi)下

iPhone4s充(chong)電器(qi)充(chong)iPad2 約14小時 0.5以(yi)下

iPad2充(chong)電器(qi)充(chong)iPhone4s 約3小時 0.83以下

iPad2充電器(qi)充iPad2 約9小時 1以下

從檢測(ce)結果(guo)看(kan)，iPad充(chong)(chong)電(dian)器給iPhone4s充(chong)(chong)電(dian)時(shi)，電(dian)流一直(zhi)(zhi)都(dou)在額(e)定電(dian)流以(yi)下，比用(yong)iPhone充(chong)(chong)電(dian)器充(chong)(chong)電(dian)的(de)電(dian)流稍大，速度也(ye)稍快(kuai)一些(xie)；用(yong)iPhone充(chong)(chong)電(dian)器給iPad充(chong)(chong)電(dian)時(shi)，雖然iPad上(shang)沒有顯示(shi)充(chong)(chong)電(dian)，但(dan)實際上(shang)一直(zhi)(zhi)在充(chong)(chong)電(dian)，只(zhi)是需要的(de)時(shi)間(jian)相當長。

但不(bu)管哪種(zhong)方式充電(dian)，整個充電(dian)過程中的電(dian)流(liu)都(dou)是先(xian)低后(hou)高，然(ran)后(hou)慢慢下降，當(dang)電(dian)量到90%左右時，電(dian)流(liu)會越來越小。

“如果(guo)開始(shi)充(chong)電(dian)(dian)時電(dian)(dian)池(chi)電(dian)(dian)量很低，那么必須用(yong)小電(dian)(dian)流(liu)開始(shi)充(chong)電(dian)(dian)，小電(dian)(dian)流(liu)充(chong)電(dian)(dian)是(shi)為了保護(hu)電(dian)(dian)池(chi)，避免大電(dian)(dian)流(liu)沖擊給電(dian)(dian)池(chi)內部結構帶來(lai)損害；而當(dang)電(dian)(dian)池(chi)電(dian)(dian)壓達到或接近(jin)充(chong)滿電(dian)(dian)壓時，則(ze)要開始(shi)轉入恒壓充(chong)電(dian)(dian)，如果(guo)不轉入小電(dian)(dian)流(liu)充(chong)電(dian)(dian)，就可能導(dao)致(zhi)電(dian)(dian)壓過(guo)高，有過(guo)充(chong)的(de)危險，也(ye)是(shi)對電(dian)(dian)池(chi)有害的(de)。”蔡(cai)老師(shi)說。

但(dan)即(ji)使是(shi)用iPad充(chong)電(dian)(dian)器給(gei)iPad充(chong)電(dian)(dian)，實際電(dian)(dian)流(liu)也(ye)沒有大于1A，這是(shi)為什么呢？

蔡老師說，iPad和iPhone會(hui)根(gen)據電(dian)(dian)(dian)池(chi)的余(yu)量來選(xuan)擇充電(dian)(dian)(dian)方案，當電(dian)(dian)(dian)池(chi)完(wan)全耗光時，就相(xiang)當于一(yi)個(ge)餓了(le)很(hen)長時間(jian)的人，不(bu)能(neng)一(yi)下子進食太(tai)多，而應該一(yi)點(dian)一(yi)點(dian)慢(man)慢(man)吃，所以(yi)完(wan)全放電(dian)(dian)(dian)后充電(dian)(dian)(dian)，比有余(yu)電(dian)(dian)(dian)時充電(dian)(dian)(dian)的電(dian)(dian)(dian)量更小一(yi)些，時間(jian)也更長一(yi)些。