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範例:熱能與溫變[98學測]

一個裝有3.0公升水的電熱式保溫熱水瓶,當通電保溫時,可使瓶內水溫一直保持為98℃。若拔掉電源,則如圖1所示,瓶內水溫隨時間下降,在最初水溫為98℃時,水溫以每分鐘約0.32℃的速率下降。

假設室內溫度固定不變,而在不同溫度下,水的比熱固定為4.2×103 J/(kg.k),試回答以下4-5題。

(1) 當水溫為98℃時,拔掉電源,則在斷電後之最初50分鐘,瓶內熱水損失的熱量約為多少焦耳?

(2) 持續通電使水溫保持為98℃時,瓶內熱水每50分鐘所吸收的熱量,約為多少焦耳?

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Posted in 歷屆學測(推甄)考題, 熱容量與比熱, 能量的形式.

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