Power supply

Discussion in 'General Electronics Chat' started by Elric429, Nov 27, 2009.

  1. Elric429

    Thread Starter New Member

    Nov 27, 2009
    4
    0
    Can I use a 12volt 18 amp power supply on a system that asks for a 12 volt 13.3 amp
    Many thanks to all that can help
     
  2. ELECTRONERD

    Senior Member

    May 26, 2009
    1,146
    16
    Absolutely. The power supply you have (12V 18A) simply indicates that it can withstand higher current loads; or up to 18A. If you go over this current, the voltage will begin to drop significantly. Since you only require 13.3A, that is well below the maximum current rating.

    Austin
     
  3. Elric429

    Thread Starter New Member

    Nov 27, 2009
    4
    0
    so is the rule of thumb over amps ok but not volts
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Yes.

    If the load is provided the proper voltage, it will only draw the amount of current that it needs.
     
  5. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Well, that is true if the power supply is a regulated one. If not you will soon find out that the only truth will be the smoke out of your system. :cool:
    If the power supply is regulated then its output voltage is held constant regardless of the output current (up to the rated value of course). However, if the power supply is unregulated the output voltage will equal the rated voltage only if the current drawn is equal to the rated current. Always use regulated power supplies for electronic equipment.
     
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