Light Bulb Circuit Board
Thebaseholdsthebulbuprightandconnectstotheelectriccircuit.Copperandleadwireslettheelectricitypassfromthebasetothetungstenfilament.It ...,Thefilamentisenclosedinaglassbulbthatiseitherevacuatedorfilledwithinertgastoprotectthefilamentfromoxidation.E...。參考影片的文章的如下:

