Can a DC transformer 12V 5A support 2 devices each 12V 4A?

Discussion in 'General Electronics Chat' started by e-z, May 31, 2015.

  1. e-z

    Thread Starter New Member

    May 31, 2015
    2
    0
    So, i have two 12V 4A devices and only one transformer of 12V 5A.
    Can i connect both to the same transformer together, or if i connect both, the transformer will have to deliver 8A?
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,652
    2,348
    Hello,

    NO, you can only use one on the transformer.
    Using both together will burn the transformer.

    Bertus
     
    wmodavis and e-z like this.
  3. e-z

    Thread Starter New Member

    May 31, 2015
    2
    0
    Thanks!
     
  4. crutschow

    Expert

    Mar 14, 2008
    13,056
    3,245
    Note that if you add a rectifier/capacitor to get DC from the transformer (as implied by the thread's title) than you need to derate it to 50-60% of its AC rating to avoid overheating.
    A rectifier/capacitor draws high peak currents from the transformer which causes higher I^2*R heating in the transformer than the rated AC sinewave current.
     
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