phy-電學 急!

2011-01-09 6:34 pm

圖片參考:http://img832.imageshack.us/img832/9217/51925849.jpg

In above circuit, all resistors shown are the same. If the currentpassing
through point X is 1A, what will the current delivered from the battery be?
唔該解釋得詳細小小 聽日要考試!!!

回答 (1)

2011-01-09 7:00 pm
✔ 最佳答案
假設最上數落黎第1條迴路叫1 , 第2叫2 , 最下個條叫3
假設電路電阻.內阻等...忽略,

電流從每個迴路的總potential different = 0/你亦可以諗並聯電壓相同


考慮迴路2
V=IR
而I = 1

考慮迴路1
V=IR
I = 1 (因為並聯電壓相同,而R亦相同)

考慮迴路3
V=I(2R)
R = 2IR (從迴路1OR2 得知...V = 1R =R)
1 = 2I
I = 0.5

總電流I = 3個迴路電流合計 = 1+1+1/2 = 2.5A
參考: 自己


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