【題目】一塊數(shù)碼相機(jī)中用的鋰電池的電壓為3．6 V，容量為1 000 mA·h（相當(dāng)于用1 000 mA的電流可放電1 h，用500 mA的電流可放電2 h，以此類推）。當(dāng)關(guān)閉液晶屏?xí)r可拍攝照片400張左右，則每拍一張照片所消耗的電能約為_(kāi)_______J；當(dāng)打開(kāi)液晶屏?xí)r可拍攝照片150張左右，則每拍一張照片液晶屏消耗的電能約為_(kāi)_______J。

【答案】32．4；54

【解析】電源輸出的總電能

E＝UQ＝UIt＝3．6×1×3 600 J＝12 960 J

關(guān)閉液晶屏?xí)r，每拍一張照片消耗的電能E1＝＝32．4 J

打開(kāi)液晶屏?xí)r，每拍一張照片消耗的電能E2＝＝86．4 J

每拍一張照片液晶屏消耗的電能E3＝E2－E1＝86．4 J－32．4 J＝54 J

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