電腦的USB規範的輸出是5V/ 500mA 但電源插頭,要實際看電源轉換器(AC110 to DC 5v)上面的標示,每個都不太一樣。如果是低耗電的USB產品,例如手機、隨身聽之類的,都會設計在5V/ 500mA 以下,那麼電源轉換器規格也在500mA以上的話,USB插電腦或插家電110V,就沒有差。
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