ideal transform

Discussion in 'Homework Help' started by full, Jan 6, 2015.

  1. full

    Thread Starter Member

    May 3, 2014
    225
    2
    ideal transform
    why there is negative in I2 mash 1 and I1 mash 2?
    Capture.PNG
     
  2. shteii01

    AAC Fanatic!

    Feb 19, 2010
    3,393
    497
    If you ASSUME that clockwise direction is positive. Then I2, which is in counter clockwise direction, is negative.

    8(I1)+(-4j)[I1-(-I2)]+V1-100=0
    8(I1)+(-4j)[I1+I2]+V1=100
    8(I1)+(-4j)I1+(-4j)I2+V1=100
    (8-4j)I1-4j(I2)+V1=100
     
    full likes this.
  3. WBahn

    Moderator

    Mar 31, 2012
    17,750
    4,797
    Uhm... because the impedance of a capacitor is negative?

    What is your reasoning for why you think it should be addition and not subtraction -- there are a couple of possible reasons for the misunderstanding.
     
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