iPad充電器給iPhone充電：安全

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

iPhone充電器(qi)給iPhone充電（完(wan)全(quan)放電）

iPad充電器(qi)給iPhone4s充電（完全放電）

在蘋果(guo)官(guan)網的(de)技術支持區里(li)有這(zhe)樣一段說明(ming)：iPad USB電(dian)源(yuan)(yuan)適(shi)(shi)配器(qi)是(shi)一個10W的(de)充電(dian)器(qi)。雖然此iPad 10W USB電(dian)源(yuan)(yuan)適(shi)(shi)配器(qi)設計為供(gong)iPad使用，但是(shi)您仍可通過其(qi)對所(suo)有iPhone和iPod機(ji)型充電(dian)。

但對(dui) “果粉”來(lai)說，有條微博(bo)讓(rang)人很糾結：請不要用iPad的(de)充(chong)電(dian)(dian)(dian)(dian)器為iPhone充(chong)電(dian)(dian)(dian)(dian)，雖然(ran)它們看起來(lai)長得一樣，兩者的(de)充(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)壓也都(dou)是(shi)5V，但是(shi)iPhone充(chong)電(dian)(dian)(dian)(dian)的(de)額定電(dian)(dian)(dian)(dian)流是(shi)1A，而(er)iPad卻是(shi)2.1A……混用充(chong)電(dian)(dian)(dian)(dian)器的(de)后果是(shi)既傷iPhone又傷iPad充(chong)電(dian)(dian)(dian)(dian)器”。

iPad和iPhone充電器到底(di)能(neng)不(bu)能(neng)混用？口(kou)說無(wu)憑，實(shi)驗為(wei)(wei)證，《好奇(qi)實(shi)驗室》為(wei)(wei)你(ni)實(shi)測。

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

中國計量學院(yuan)機電(dian)工程學院(yuan)的(de)蔡(cai)慧老師說(shuo)，iPad充電(dian)器(qi)的(de)功(gong)率(lv)10W，是指電(dian)源的(de)最大輸出功(gong)率(lv)，但實際(ji)輸出功(gong)率(lv)要取決于所接(jie)的(de)負載；iPad和iPhone的(de)充電(dian)器(qi)的(de)額(e)定電(dian)壓都(dou)是5V，只要實際(ji)電(dian)流不(bu)超過額(e)定電(dian)流（即iPhone1A，iPad2.1A），也不(bu)會對充電(dian)設備造成(cheng)傷害。

iPad和(he)iPhone的充(chong)(chong)電(dian)器連(lian)(lian)接線(xian)都是一(yi)樣(yang)的，我們把它(ta)剪斷，里面有紅(hong)黑白綠(lv)四條線(xian)，經(jing)檢測，紅(hong)線(xian)是電(dian)源線(xian)，黑線(xian)是地線(xian)，當連(lian)(lian)接線(xian)和(he)iPad充(chong)(chong)電(dian)器相(xiang)連(lian)(lian)時，在白線(xian)和(he)綠(lv)線(xian)上分別檢測到了2V和(he)2.7V電(dian)壓(ya)(ya)，而當連(lian)(lian)接線(xian)和(he)iPhone充(chong)(chong)電(dian)器連(lian)(lian)接時，白、綠(lv)兩條線(xian)上沒有測到電(dian)壓(ya)(ya)。

“白、綠兩條線(xian)是信號(hao)線(xian)，當(dang)iPad或iPhone接上充電器時，通(tong)過這兩條線(xian)可以區分當(dang)前使用的(de)(de)是哪種充電器，能對負載(zai)做出相應(ying)的(de)(de)調整(zheng)。”蔡慧(hui)老師說。

我們(men)先(xian)用萬(wan)能表對各種充電(dian)方式進行檢(jian)測。

iPad充(chong)電(dian)器（單位：A） iPhone充(chong)電(dian)器（單位：A）

50%電量的iPadA 1.5 0.48

60%電量(liang)的iPadB 1.5 1.26

70%電(dian)量的(de)iPad2 1.4 0.48

39%電量的(de)iPhone4 0.98 0.45

40%電量的iPhone4s 0.88 0.9

從(cong)檢測結果看，iPad充電(dian)(dian)(dian)器給(gei)iPhone充電(dian)(dian)(dian)時，實際(ji)電(dian)(dian)(dian)流都低于(yu)1A，而用iPhone充電(dian)(dian)(dian)器給(gei)iPad充電(dian)(dian)(dian)時，iPadA和iPad2顯(xian)(xian)示“沒(mei)有充電(dian)(dian)(dian)”，顯(xian)(xian)示“正在充電(dian)(dian)(dian)”字樣的iPadB的實際(ji)電(dian)(dian)(dian)流偏大，超過了1A。

“iPadB里的(de)(de)一些(xie)系統軟(ruan)件可能被更改(gai)了，導致這(zhe)樣(yang)的(de)(de)問題出現，用iPhone充(chong)(chong)電(dian)器(qi)充(chong)(chong)電(dian)時，iPad是不會(hui)有損傷(shang)的(de)(de)，因為電(dian)流小于額定電(dian)流，但對(dui)充(chong)(chong)電(dian)器(qi)會(hui)有損傷(shang)，時間一長，充(chong)(chong)電(dian)器(qi)就會(hui)壞掉。”

我們注意到，不(bu)同(tong)電(dian)(dian)量的(de)(de)(de)設(she)備，充電(dian)(dian)的(de)(de)(de)實際(ji)電(dian)(dian)流大小也是(shi)不(bu)一樣的(de)(de)(de)，蔡(cai)老師解釋(shi)說，這是(shi)因為智能(neng)電(dian)(dian)池在充電(dian)(dian)過程中，為了(le)保持電(dian)(dian)池不(bu)受傷害，所以電(dian)(dian)流的(de)(de)(de)大小是(shi)會發生改變的(de)(de)(de)。

為更(geng)詳細(xi)地了解整個充電(dian)過程，我們決定把(ba)iPad和(he)iPhone完全放電(dian)到0%后，再(zai)進(jin)行充電(dian)，并用萬能表連接(jie)電(dian)腦(nao)來記錄整個充電(dian)過程――由(you)于時間關系，我們選擇了iPad2和(he)iPhoe4s來進(jin)行實驗。

時間 實際電流（單位(wei)：A）

iPhone4s充(chong)電器充(chong)iPhone4s 約(yue)4小時 0.8以(yi)下(xia)

iPhone4s充(chong)電器充(chong)iPad2 約14小時(shi) 0.5以下(xia)

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

iPad2充(chong)電器充(chong)iPad2 約(yue)9小時 1以下

從檢測結(jie)果看，iPad充(chong)(chong)電(dian)(dian)(dian)器(qi)給iPhone4s充(chong)(chong)電(dian)(dian)(dian)時，電(dian)(dian)(dian)流一直都在額定(ding)電(dian)(dian)(dian)流以下，比(bi)用iPhone充(chong)(chong)電(dian)(dian)(dian)器(qi)充(chong)(chong)電(dian)(dian)(dian)的(de)電(dian)(dian)(dian)流稍(shao)大，速度也稍(shao)快一些；用iPhone充(chong)(chong)電(dian)(dian)(dian)器(qi)給iPad充(chong)(chong)電(dian)(dian)(dian)時，雖然(ran)iPad上(shang)沒有顯示充(chong)(chong)電(dian)(dian)(dian)，但實際(ji)上(shang)一直在充(chong)(chong)電(dian)(dian)(dian)，只是需要(yao)的(de)時間(jian)相當長。

但不管哪種(zhong)方(fang)式充(chong)電(dian)(dian)，整個充(chong)電(dian)(dian)過程中的(de)電(dian)(dian)流都是先(xian)低后高(gao)，然后慢慢下降，當電(dian)(dian)量(liang)到90%左右時(shi)，電(dian)(dian)流會(hui)越來(lai)越小。

“如(ru)果(guo)(guo)開(kai)(kai)始(shi)充(chong)電(dian)時(shi)電(dian)池(chi)電(dian)量很低(di)，那么必(bi)須用(yong)小(xiao)電(dian)流(liu)(liu)開(kai)(kai)始(shi)充(chong)電(dian)，小(xiao)電(dian)流(liu)(liu)充(chong)電(dian)是為了保(bao)護電(dian)池(chi)，避免大(da)電(dian)流(liu)(liu)沖(chong)擊給電(dian)池(chi)內部結構帶來損害(hai)；而(er)當電(dian)池(chi)電(dian)壓(ya)(ya)(ya)達(da)到(dao)或接近充(chong)滿電(dian)壓(ya)(ya)(ya)時(shi)，則要開(kai)(kai)始(shi)轉入恒壓(ya)(ya)(ya)充(chong)電(dian)，如(ru)果(guo)(guo)不(bu)轉入小(xiao)電(dian)流(liu)(liu)充(chong)電(dian)，就可能導致電(dian)壓(ya)(ya)(ya)過高，有過充(chong)的危險，也是對電(dian)池(chi)有害(hai)的。”蔡(cai)老師說(shuo)。

但即使是用(yong)iPad充電器給(gei)iPad充電，實際電流也沒有大于(yu)1A，這是為什么呢？

蔡(cai)老師說(shuo)，iPad和iPhone會(hui)根據電池的(de)(de)余量來選(xuan)擇充電方案，當電池完全(quan)耗光時(shi)，就相(xiang)當于一(yi)(yi)個餓(e)了很(hen)長時(shi)間的(de)(de)人，不能一(yi)(yi)下子進食太多，而(er)應該一(yi)(yi)點一(yi)(yi)點慢慢吃，所以(yi)完全(quan)放電后充電，比有(you)余電時(shi)充電的(de)(de)電量更小一(yi)(yi)些，時(shi)間也更長一(yi)(yi)些。