本帖最後由 小莓。改 於 21-4-2009 18:54 編輯
20條標準ANS : 經某校老師及同學驗證:
As there is a word "within" there, so only resistance can work on that question.
Therefore current flown = 2.5A
[44條有講用SWITCH 嗎,唔好作OC argument,因為你都可以講人手泵電 ? 沒有, A] 我錯了...是B
我老師講了一個PT : variating current
19條 switch is open = measures the emf of the cell = 12V |
發表於 20-4-2009 20:16:18