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5V 2.5A Power Supply Wattage Calculation Formula and Example

stasw147 32190 4
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
  • #1 3444058
    stasw147
    Level 15  
    Hello, I have such a problem because I have a 5v to 2.5A power supply, what is its power, means how much current it consumes and what is the formula so that you can easily count such things in advance, thank you
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    #2 3444120
    emeryt2
    Level 42  
    Hello, It's very simple :P = UxI, and you don't know the rest, this is a pattern of power.
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    #3 3444122
    ALUŚ
    Level 36  
    Hello !


    P = U x I = 5 x 2.5 = 12.5 W.
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    #4 3444132
    Jerzy Węglorz
    Level 39  
    I have a problem because I don't know if you went to school and they usually say something about Ohm's law ...
    Power is the product of voltage and current, so 5V times 2.5A is 12.5W (watts).
    If it is a power supply that takes electricity from the lighting network (230V), the current consumption is 12.5W divided by 230V, which gives 54 mA (milliamperes). Since the efficiency (efficiency, i.e. the ratio of the given power to the power consumed) for such a power supply is approx. 50%, it means that the current consumption will in fact be twice as high (approx. 100mA).
  • #5 3452766
    stasw147
    Level 15  
    I walked but I had to forget thanks
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