作者查詢 / profyang
作者 profyang 在 PTT [ Physics ] 看板的留言(推文), 共1072則
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16F推: ...y/2<y阿= =03/20 22:53
4F推: 印象中這兩個是等價的 另外1F推的才是真正定義無誤 但是03/20 20:55
5F→: 分子應該改成energy 不然會造成誤會03/20 20:56
9F推: 看不懂 單獨一塊金屬本來就有電容阿03/17 09:15
10F→: 單單一塊金屬就有電荷 電壓(相對於無窮遠) 這樣當然可以03/17 09:16
11F→: 定義電容 這應該普物就有講了吧03/17 09:16
18F推: 實在不知道原PO在想啥 誰跟你說一塊金屬不能當電容的?03/17 16:15
19F→: 還是不能當指的是效率不好?電容太小?03/17 16:16
37F推: 怎麼會沒有displacement current 你接條AC電線到金屬上03/17 22:17
38F→: 電荷在變 電場就也在變 有時變電場整個空間就有位移電流03/17 22:18
39F→: 也許在inf是趨近於0 但這樣還叫沒有AC特性?一樣I=CdV/dt03/17 22:19
40F推: 我不知道你說傳能量是要傳到哪裡 如果你想像的是像一般03/18 10:17
41F→: 電容兩個端點 端點1有進來信號 端點2就有信號過去 這樣03/18 10:18
42F→: 是無法 因為你用單一金屬當電容根本就只有一個端點阿03/18 10:18
43F→: 但他確實有能量傳到無窮遠的地 除非你把你電路的地接到03/18 10:19
44F→: 跟無窮遠等電位03/18 10:19
45F→: 另外發電廠傳電詳細機制我不清楚 不過他應該有地線火線03/18 10:21
46F→: 水線什麼的吧?應該不會只有一條線03/18 10:21
47F→: 只有單一金屬想傳能量過去只可能弄成波導 不然早就輻射03/18 10:22
48F→: 光了吧03/18 10:22
65F推: 電容幾時說場要均勻...coaxial電容也沒有均勻阿 只要03/19 00:33
66F→: Q=CV或AC的I=C*dv/dt就是電容了阿03/19 00:33
67F→: 重點是你接個電線到這金屬上 電線流過去的電流I和金屬上03/19 00:34
68F→: 的電壓V有I=C*dV/dt的關係 這樣就是有AC電容了特性了阿03/19 00:35
5F噓: 高中生嗎...不會去問你們老師?= =02/28 17:16
23F推:爽XD 版主英明07/03 12:12
7F推:因為你是用自己硬的打方打別人軟的地方...03/22 13:30
8F→: 地03/22 13:31
10F推:版主英明!!03/17 00:34
8F推:直接pi*R^2阿~03/16 17:03
1F推:首先 你手如果直接去碰到插座裡面的電極兩端就是被電02/23 11:30
2F→:水只是很能延伸 幫你把電極接出來電你而已02/23 11:30
6F推:恩感覺就比較接近串聯 當然假設你手的部分沒碰到電極02/23 11:46
7F→:所以電阻應該不會減少吧02/23 11:46
16F推:怎麼算...真要精確算出來只能數值解了阿~02/22 03:17