為甚麼ammeter唔可以connected in parrallel?Voltmeter唔可以connected in series?
Thankyou!
2007-01-08 12:40:05 · 2 個解答 · 發問者 Alice 5 in 科學 ➔ 其他：科學
I still don't understand ,can you explain it more in details?Thankyou!
2007-01-08 13:01:46 · update #1
V = IR
Voltmeter 用黎度voltage 既 , 所以 R 要好大
如果in series 既話你就會留意到電流 I 會變得好細
V 就會變到好大 , d 數值就會亂晒
所以駁parallel 就可以唔影響電流改變之餘
又可以準確量度個 circuit 既 V
(因為parallel 上既V同main circuit都係一樣 , 同埋電流
會流向低電阻既方向 , 所以只有極少部分既current 流向voltmeter)
相同道理 , in series 既ammeter 先可以準確量度個current
因為parallel 既話會「分」走左main circuit 既current , 影響結果
2007-01-08 14:22:35 · answer #1 · answered by Yiubish 4 · 0⤊ 0⤋
Current is flowing THROUGH a circuit, whereas voltage is ACROSS two points.
Bearing this in mind, you would visualize that why you cannot connect an ammeter in parallel and a voltmeter in series.
2007-01-09 14:28:51 補充：
Since a detailed explanation is too lengthly to be put here, which is restricted to 300 alphabets. Would you mind ask the question again as a [New Qustion] so that I could give you a more detailed answer?
2007-01-08 12:53:42 · answer #2 · answered by 天同 7 · 0⤊ 0⤋