電流I 經燈從X流到Y
2011-12-26 12:52 am
圖片參考：http://imgcld.yimg.com/8/n/HA00870749/o/701112250038713873415190.jpg
在圖中，燈泡兩端的電壓為5V，電流I 經燈從X流到Y。那些是正確?
(1) X和Y之間的電勢差是5V(2) 一庫倫的正電荷在X的電勢能較在Y的電勢高5J(3) 每當一庫倫的電荷經過燈泡時，5J的電勢能轉變為熱能和光能 A 只有(1)和(2)B 只有(1)和(3)C只有(2)和(3)D (1)’(2)’(3)
回答 (1)
2011-12-26 2:03 am
✔ 最佳答案
All three statements are correct. The answer is option D.This follows from the definition of potential difference, which is the energy released (in Joules) by 1 coulomb of charge when it falls through that amount of potential difference.
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20111225000051KK00387