基本電學 關於電功率的問題?? - 考試
By Michael
at 2013-10-16T14:26
at 2013-10-16T14:26
Table of Contents
題目:某手機待機消耗功率為0.036W,其電池額定3.6V,900mAH;理想情況下若電池充飽電
,則可待機多少小時?
(A)90 (B)70 (C)50 (D)30。
答案:(A)90
以下為在奇摩知識上找到的解答
W = Pt = 0.036t ( W/s )
W = VIt = 3.6 * 900m * 3600 = 11664 ( W/s )
所以 11664 = 0.036t
t = 11664 / 0.036 = 324000 ( s ) = 90 ( h )
看了詳解之後還是不太懂
為什麼第2行要乘以3600?
想請教一下各位前輩高手們本題之觀念,或者是有無其他更清楚易懂的解法可以解釋本題?
謝謝囉! ^_^
--
,則可待機多少小時?
(A)90 (B)70 (C)50 (D)30。
答案:(A)90
以下為在奇摩知識上找到的解答
W = Pt = 0.036t ( W/s )
W = VIt = 3.6 * 900m * 3600 = 11664 ( W/s )
所以 11664 = 0.036t
t = 11664 / 0.036 = 324000 ( s ) = 90 ( h )
看了詳解之後還是不太懂
為什麼第2行要乘以3600?
想請教一下各位前輩高手們本題之觀念,或者是有無其他更清楚易懂的解法可以解釋本題?
謝謝囉! ^_^
--
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考試
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