最近流傳(chuan)著這樣一條微(wei)博：“請不要用iPad的(de)(de)充(chong)(chong)電(dian)(dian)(dian)(dian)器為iPhone充(chong)(chong)電(dian)(dian)(dian)(dian)，雖然看(kan)起來他們(men)長的(de)(de)一樣，兩者的(de)(de)充(chong)(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)壓都是5V，iPhone的(de)(de)充(chong)(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流是1A，而(er)iPad卻是2.1A，根(gen)據P=UI可得iPhone充(chong)(chong)電(dian)(dian)(dian)(dian)器的(de)(de)功率為5W，而(er)iPad為10.2W。這樣做的(de)(de)后(hou)果是既傷iPhone又傷iPad充(chong)(chong)電(dian)(dian)(dian)(dian)器。”

  微博(bo)一(yi)出(chu)，四處(chu)轉發(fa)，同時(shi)擁有(you)iPad和iPhone的(de)人(ren)無不懊悔地(di)反思自己的(de)充(chong)電(dian)(dian)(dian)行為。不過，緊接著果殼網“謠言粉(fen)碎(sui)機”發(fa)文(wen)稱(cheng)，“這(zhe)條微博(bo)的(de)原始(shi)作者并不真正懂(dong)得電(dian)(dian)(dian)子知識，只是單(dan)純依據充(chong)電(dian)(dian)(dian)器的(de)參數，想當然(ran)地(di)得出(chu)了這(zhe)樣(yang)一(yi)個錯(cuo)誤(wu)的(de)結論。”

  探究：蘋(pin)果公司在充電設計上(shang)有“講究”

  iPad和iPhone充(chong)電器的(de)(de)設計(ji)不(bu)同(tong)是有原因的(de)(de)。iPhone的(de)(de)電池(chi)容量(liang)較小，只需要1A的(de)(de)充(chong)電電流就能在一個合(he)理的(de)(de)時間(jian)內(nei)完成充(chong)電，又不(bu)損害電池(chi)。

  iPad的(de)(de)(de)(de)充(chong)(chong)電(dian)(dian)器(qi)(qi)上(shang)標(biao)明了2.1A，指的(de)(de)(de)(de)是iPad的(de)(de)(de)(de)充(chong)(chong)電(dian)(dian)器(qi)(qi)最大只能(neng)輸出(chu)2.1A的(de)(de)(de)(de)電(dian)(dian)流。當你用iPad的(de)(de)(de)(de)充(chong)(chong)電(dian)(dian)器(qi)(qi)給(gei)iPhone充(chong)(chong)電(dian)(dian)時，雖然iPad的(de)(de)(de)(de)充(chong)(chong)電(dian)(dian)器(qi)(qi)最大能(neng)夠提供2.1A的(de)(de)(de)(de)電(dian)(dian)流，但由于iPhone只能(neng)接受1A的(de)(de)(de)(de)電(dian)(dian)流，iPad的(de)(de)(de)(de)充(chong)(chong)電(dian)(dian)器(qi)(qi)也會遷(qian)就它。這就好比在四車(che)道的(de)(de)(de)(de)公路上(shang)開(kai)車(che)，遇到收費(fei)(fei)(fei)站(zhan)的(de)(de)(de)(de)時候，只有(you)1個收費(fei)(fei)(fei)亭(ting)開(kai)著(zhu)，那么同(tong)時通過收費(fei)(fei)(fei)站(zhan)的(de)(de)(de)(de)汽車(che)最多也就只有(you)1輛。

  蘋果公司為了讓旗下的所有充電器和數碼產品能夠盡量混用，還在USB接口的兩個數據引腳上增加了分壓電阻，使充電的設備能夠在充電時讀到兩個電壓。當iPad或者iPhone接上充電器時，通過這兩個引腳上不同的電壓就可以區分當前使用的是哪種充電器，也就(jiu)能對負載做出相應的(de)調整，從而安(an)全地充電。

  實(shi)驗：用iPad充(chong)電(dian)器給iPhone充(chong)電(dian)未見異常(chang)

  為(wei)了驗(yan)證果殼網“謠言粉碎機(ji)(ji)”的結論，本(ben)報記者用(yong)iPad和iPhone原(yuan)裝的充(chong)(chong)(chong)電(dian)器(qi)給兩(liang)個(ge)電(dian)量(liang)僅(jin)余10%左右的iPhone3GS進(jin)行充(chong)(chong)(chong)電(dian)，手(shou)機(ji)(ji)始終(zhong)保持開機(ji)(ji)，電(dian)量(liang)充(chong)(chong)(chong)滿均為(wei)3小時(shi)左右，用(yong)iPad充(chong)(chong)(chong)電(dian)器(qi)充(chong)(chong)(chong)電(dian)的iPhone未見任何異常。