取數個電阻為R的電熱器與數個固定電壓為 V的電源，將之連結，用以加熱杯中的水至沸騰。假設加熱過程中無熱量散失，杯子與電熱器的吸熱忽略不計，且杯中的水量及最初的水溫均相同，則下列哪一個裝置所需的加

問題詳情

4. 取數個電阻為R的電熱器與數個固定電壓為 V的電源，將之連結，用以加熱杯中的水至沸騰。假設加熱過程中無熱量散失，杯子與電熱器的吸熱忽略不計，且杯中的水量及最初的水溫均相同，則下列哪一個裝置所需的加熱時間最短？
(A)
(B)
(C)
(D)

參考答案

答案：B
難度：計算中-1
書單：沒有書單，新增

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