After I shut down my PC I like to pull the power cord out from wall but before pulling the power cord out from wall do I need first to flip the power supply sw
I found this answer on the internet but because I'm not that good in English I didn't fully understand what he said can someone please explain to me if according to him when flip the PSU switch button then unplug the cord is bad ? He said arcing but I didn't fully understand . The answer I found : All the switch does is breaking metallic continuity between the power cable and internal circuitry, which is exactly what pulling the plug does anyhow.
The only difference between the two is that the switch is designed to minimize make/break arcing while the plug isn't. This is mainly a concern while plugging in where there may be a huge inrush current surge while input caps get charged up and if contact is made slowly, the arc may melt/vaporize some connector metal which can cause significant premature wear and create some 'cracking' noises that may spook people. The same thing happens inside switches but because switches have very fast 'snap' action, the amount of time the arc may exist is much shorter and the amount of damage it may cause is much less. Switch contact points may also be made of tungsten to further minimize sputtering.
When disconnecting a PSU that is already in soft-off state, there isn't much current going through the cable (only what the 5VSB needs) and there would be little to no arcing.
Long story short: the switch is almost optional, it is mainly there to spare cable connectors some arcing while plugging it in.
Unless you live in an ear where the electricity is dirty and there is always some type of power flux, you don't need to do any of that stuff.
Can you link to where you have found these findings? I suspect you're running off old information.
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