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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
The mains voltage is AC that swings positive then negative over and over.
The LED works from DC so the rectifier diode rectifies the mains voltage so it produces only humps of positive voltage.
The LED lights each half cycle of the mains that is a positive voltage.
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