雙切開關的疑問 - 居家修繕
By Jessica
at 2015-04-03T05:11
at 2015-04-03T05:11
Table of Contents
我家樓梯間的燈炮是用舊時省線的雙切接法~
換LED燈泡後在關燈時還是會有持續餘光~
(開關都是沒小燈泡的)
據所是因LED只要有微小電壓就亮~
我的疑問是~
省線的雙切接法~有可能是一邊火線~另一邊水線(或反之)...所以燈會亮~
也有可能二邊都火線~或二邊都水線~那不會亮~
但若二邊都水線...
燈泡應該是不會有餘光現象?
總不可能連水線都有微小電壓吧?
這是我最想不通的事~
示意圖
開關1 燈座 開關2
水 接一端 水
__________________ _____________
火 接一端 火
我的省線雙切想法應該沒錯吧?
謝謝
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Tags:
居家修繕
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