Computer psu

Discussion in 'General Electronics Chat' started by Peter basolo, Jul 13, 2015.

  1. Peter basolo

    Thread Starter Member

    Nov 24, 2014
    38
    0
    if I connect a 12 v to positive and 12- to negative is the voltage 12 or 24? Does it affect the current?
     
  2. Lestraveled

    Well-Known Member

    May 19, 2014
    1,957
    1,215
    Voltages are measured relative to ground. There is a supply that provides 12 volts above ground and there is a supply the provides 12 volts below ground. It is not considered a 24 volt supply.
     
  3. ScottWang

    Moderator

    Aug 23, 2012
    4,855
    767
    If you have a common pin then that is 24V, the 12V can be provide more current as 25A for a 350W psu, and 0.8A for -12V, what is your purpose(application) for this psu, you can see that the current is unbalance, show your psu that it has a label beside the psu and you can see all the details of voltage and current.
     
  4. wayneh

    Expert

    Sep 9, 2010
    12,127
    3,049
    The -12V side of a computer PSU cannot usually sink as much current as the +12V can source. For example the +12V side might be rated to 1-2A while the -12V side is rated to just 100-200mA. The voltage between them is 24V, although it may not measure that way without a low-pass filter. But either way the current is limited by the weaker link.
     
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