Power supply - Voltage calculate help

[Net3]

Yo guys! I just wanna to ask you, if you know how to calculate any power supply voltage since the current is the easiest, but yet I dont get it about Voltage. 

If u could show me, what things I need to 

Divide and multiply and so on.. I would be really grateful.

[genexis_x]

Hmm old P4 design there...

+3.3V multiply 35A to get total wattage for 3.3V rail

+5V multiply 40A to get total wattage for 5V rail

For the +12V rail, you should check for its combined wattage since it's a dual rail PSU, @STRMfrmXMN can you help?

 

Edit: IMO, you should change the PSU ASAP

[Dujith]

Not really sure what u want? The PSU for a computer is a voltage source (bad translation from dutch :D) so it will output a steady voltage and adjust the current dependent on the power draw.

 

In the most simplest forumula: P = U x I (Power equals the voltage multiplied by the current)

[Net3]

2 minutes ago, ZM Fong said:

I calculate by myself, look for power consumption for every parts and add them together lol

(Don't trust wattage calculator website)

 

Edit: Voltage? I think you mean wattage

No! I mean power supply, power supply. 

No wattage like u know u can clacualte current just by multiplying amps and volts sequentially.

[genexis_x]

Just now, Net3 said:

No! I mean power supply, power supply. 

No wattage like u know u can clacualte current just by multiplying amps and volts sequentially.

Edited

[Net3]

13 minutes ago, ZM Fong said:

Hmm old P4 design there...

+3.3V multiply 35A to get total wattage for 3.3V rail

+5V multiply 40A to get total wattage for 5V rail

For the +12V rail, you should check for its combined wattage since it's a dual rail PSU, @STRMfrmXMN can you help?

 

Edit: IMO, you should change the PSU ASAP

U know if u multiply thing just like that, the current is right choise, but since voltage is a little bit different it's wrong .. I cought sth on what side that says 

I=4A-6A=

=-2Ax12V=

= -24 W

 

But still dont get it .. 

 

 

 

 

[genexis_x]

1 minute ago, Net3 said:

U know if u multiply thing just like that, the current is right choise, but since voltage is a little bit different it's wrong .. I cought sth on what side that says 

I=4A-6A=

=-2Ax12V=

= -24 W

 

But still dont get it .. 

I can't understand your English...

[Net3]

10 minutes ago, Dujith said:

Not really sure what u want? The PSU for a computer is a voltage source (bad translation from dutch :D) so it will output a steady voltage and adjust the current dependent on the power draw.

 

In the most simplest forumula: P = U x I (Power equals the voltage multiplied by the current)

I think that I would need an example of this to get it, sry im stupid ;P but yh ik what trying to say.

[Dujith]

2 minutes ago, Net3 said:

I think that I would need an example of this to get it, sry im stupid ;P but yh ik what trying to say.

Not stupid, just a language barrier.

Maybe it would help if we knew what u needed this information for?

[Net3]

Just now, ZM Fong said:

I can't understand your English...

Ok  neither do I .. 

Well ... u wrote a few minutes ago, that you need to mulitply volts and amps sequentially on voltage , but u can do it (by this way) only on current source

[genexis_x]

4 minutes ago, Net3 said:

but u can do it (by this way) only on current source

What do you mean by this^^^?

[Net3]

6 minutes ago, Dujith said:

Not stupid, just a language barrier.

Maybe it would help if we knew what u needed this information for?

Well .. I was always wondering how they get total wattage on the Voltage source down below, since u CAN NOT get the results the same way as just to multiply  amps and voltage on the current tho u get right numbers, but on the voltage source u always get redundant number .for example it writes 150W but u will get 200W(+) if u know what i mean

[Net3]

7 minutes ago, ZM Fong said:

What do you mean by this^^^?

You cant multiply voltage just like this lets say buy just multipling numbers sequentially 

[Net3]

13 minutes ago, ZM Fong said:

What do you mean by this^^^?

You cant multiply voltage just like this lets say buy just multipling numbers sequentially 

[Net3]

Well on the short, i just need good formual and example how ro calculate voltage 

[Dujith]

The formule i just gave u is enough.

P = U x I

 

You just need to rearrange it for your needs.

So if you need U (voltage) its U = P / I

Current (I) = P / U