接門鈴的疑問 - 居家修繕
By Freda
at 2017-04-17T23:17
at 2017-04-17T23:17
Table of Contents
我家門鈴前幾天被我拉了一下~
可能因為電線接口處包紮掉了~(沒包電火布)
結果就小碰了一聲~
這件事我一直想不通~
因為門鈴沒按下去時~
應該是沒電的~
但不管如何~
後來我把線重拉~
除門鈴處有火線~
中性線就乾脆在天花板找個燈一起包起來~
可是按下去就發現
鳥鳴聲變的非常沒力~
我本來以為是從門口拉到家裡~至少也10M~
太長了導致沒力
但再弄短點也一樣~
剛好線會經過無熔絲開關~
於是就轉念一想~
把中性線連到銅排上
結果門鈴就正常了~
這應該要怎麼解讀?
網上查到一個名詞叫"阻抗"
感覺是電子學課程很好的計算考題~
但在家庭應用上除了實測~這可以用電表測量嗎?
同樣都中性線~會有強的和弱的差別?
還是特定電器需挑中性線~
部份電器(如燈)就比較隨便?
在家庭應用上要怎麼去看待這個差別?
謝謝~
--
Tags:
居家修繕
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