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iPad充電器能否為iPhone充電?

    最近流(liu)傳著這樣一(yi)條微博:“請不要用iPad的(de)充(chong)電器為(wei)iPhone充(chong)電,雖然看(kan)起來他們長(chang)的(de)一(yi)樣,兩者的(de)充(chong)電電壓(ya)都是(shi)(shi)5V,iPhone的(de)充(chong)電電流(liu)是(shi)(shi)1A,而iPad卻是(shi)(shi)2.1A,根據(ju)P=UI可得iPhone充(chong)電器的(de)功率為(wei)5W,而iPad為(wei)10.2W。這樣做的(de)后果(guo)是(shi)(shi)既傷iPhone又傷iPad充(chong)電器。”

  微(wei)博(bo)一出,四處轉(zhuan)發,同(tong)時擁(yong)有iPad和iPhone的(de)人無不懊悔地反思自己的(de)充電(dian)行為。不過(guo),緊接著果殼網“謠言(yan)粉碎機”發文稱(cheng),“這條(tiao)微(wei)博(bo)的(de)原始作者(zhe)并不真正懂(dong)得(de)電(dian)子知(zhi)識,只是單純依據充電(dian)器的(de)參(can)數,想當然地得(de)出了(le)這樣一個錯誤的(de)結論(lun)。”

  探究(jiu):蘋果公司在充電設計上有“講究(jiu)”

  iPad和(he)iPhone充(chong)電器的(de)(de)設計不同是有原因的(de)(de)。iPhone的(de)(de)電池容(rong)量較小,只需要1A的(de)(de)充(chong)電電流就(jiu)能在一個合理的(de)(de)時間(jian)內完成充(chong)電,又不損害電池。

  iPad的(de)(de)(de)(de)充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)上(shang)標明了2.1A,指(zhi)的(de)(de)(de)(de)是iPad的(de)(de)(de)(de)充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)最(zui)大(da)只能(neng)輸(shu)出2.1A的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)流。當(dang)你用iPad的(de)(de)(de)(de)充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)給iPhone充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)時(shi),雖然iPad的(de)(de)(de)(de)充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)最(zui)大(da)能(neng)夠(gou)提供2.1A的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)流,但由(you)于iPhone只能(neng)接受1A的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)流,iPad的(de)(de)(de)(de)充(chong)(chong)(chong)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)也會遷就它。這就好比(bi)在四(si)車(che)(che)(che)道的(de)(de)(de)(de)公路上(shang)開車(che)(che)(che),遇到收(shou)費(fei)(fei)站的(de)(de)(de)(de)時(shi)候(hou),只有(you)1個收(shou)費(fei)(fei)亭(ting)開著,那么同時(shi)通過收(shou)費(fei)(fei)站的(de)(de)(de)(de)汽車(che)(che)(che)最(zui)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(ye)就能對負載做出相(xiang)應的調(diao)整(zheng),從而安全地充電。

  實(shi)驗:用iPad充電器給iPhone充電未見異常

  為了驗(yan)證果(guo)殼網“謠言粉碎(sui)機”的結論,本(ben)報記者用iPad和iPhone原(yuan)裝的充電(dian)(dian)(dian)器給(gei)兩(liang)個電(dian)(dian)(dian)量僅余10%左(zuo)右的iPhone3GS進行充電(dian)(dian)(dian),手(shou)機始終(zhong)保持開機,電(dian)(dian)(dian)量充滿(man)均為3小時左(zuo)右,用iPad充電(dian)(dian)(dian)器充電(dian)(dian)(dian)的iPhone未(wei)見任何(he)異常。

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