Power formula and current

Discussion in 'General Electronics Chat' started by Irmutis, Mar 1, 2010.

  1. Irmutis

    Thread Starter Member

    May 24, 2009
    17
    0
    Hi,

    This power formula for AC P=U*I*cosfi I=P/U*cosfi
    (cosfi is power factor) P=8000W , U=220V, f=50Hz

    I have a problem, I do not know how to find current and cosfi? Is it posible what cosfi<=1? If it is , is it posible for example, if I use at home an iron (2000W) that it takes about 10A?
     
  2. Externet

    AAC Fanatic!

    Nov 29, 2005
    759
    57
    Yes.
    I=P/U*cosfi
    I=2000/220*cos fi

    For the soldering iron, being a resistive load, cos fi is 1, then

    I=9.09 Amperes

    For inductive loads, cos fi can be <1
     
    Irmutis likes this.
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