How does a psu actually work?

[AwesomeElite]

Lets say i had a 750 watt psu from evga, would it constantly pull 750 watts from my wall or would it only pull as much as the components need?

[Flavortown2k16]

as much as components need

[RadiatingLight]

3 minutes ago, AwesomeElite said:

Lets say i had a 750 watt psu from evga, would it constantly pull 750 watts from my wall or would it only pull as much as the components need?

all a PSU does is convert AC power from your wall to DC power needed to run your computer.

if your computer needs less DC power, the PSU will take less AC power.

 

it's important to note that PSUs are rated for how much DC power they can deliver, so a 750 Watt PSU running at maximum load would take more than 750 watts from the wall.

(if the PSU had 90% efficiency, it would draw 825 Watts from the wall running at maximum load)

[GirlFromYonder]

8 minutes ago, AwesomeElite said:

Lets say i had a 750 watt psu from evga, would it constantly pull 750 watts from my wall or would it only pull as much as the components need?

as much as needed

[WereCat]

It takes as much power as PC needs + some extra based on efficiency. Let's say you have 85% efficiency and PSU needs 100W. It will actually take 15% extra from the wall, so 115W. But the power requirements fluctuate a lot as you are using your PC so the efficiency always change on different loads.

Basically... if you have any modern good quality PSU you are all set.

[STRMfrmXMN]

13 hours ago, RadiatingLight said:

all a PSU does is convert AC power from your wall to DC power needed to run your computer.

if your computer needs less DC power, the PSU will take less AC power.

 

it's important to note that PSUs are rated for how much DC power they can deliver, so a 750 Watt PSU running at maximum load would take more than 750 watts from the wall.

(if the PSU had 90% efficiency, it would draw 825 Watts from the wall running at maximum load)

When you're ninja'd 13 hours too late by a newbie on the forum