12 volt circuit really basic question

Discussion in 'The Projects Forum' started by obsessmuch, Apr 16, 2007.

  1. obsessmuch

    Thread Starter New Member

    Apr 16, 2007
    1
    0
    Hi I have a super basic question. I have a 12 volt @ 4A power supply running a device. i need to power a second device from this power suply that only requires 12 v @ 100ma how do i reduce that down?:confused:
     
  2. recca02

    Senior Member

    Apr 2, 2007
    1,211
    0
    well isnt it the case that circuits takes the req amount of current if u supply
    specified voltage?
     
  3. Eddy Kurent

    Member

    Apr 9, 2007
    18
    0
    Your second circuit will draw only the amount of current it needs to operate.
     
  4. John Luciani

    Active Member

    Apr 3, 2007
    477
    0
    Your ciruit will only draw the current it requires (I=V/R).

    If your 100mA circuit develops a fault it can draw the full 4A from the power supply.
    A fuse between the power supply and the 100mA circuit would be a good precaution.

    (* jcl *)

    ---
    www.luciani.org
     
  5. mozikluv

    AAC Fanatic!

    Jan 22, 2004
    1,437
    1
    how about a current limiter along the way?

    moz
     
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