Help with KVL

Discussion in 'Homework Help' started by sikhest, Nov 9, 2007.

  1. sikhest

    Thread Starter New Member

    Nov 1, 2007
    2
    0
    Hello,

    I know this is a simple topic for most but i keep getting confused on assigning + and - values to resistors. can someone please explain to me how I know which side the + and - sign go on each resistor in the attached picture.

    Thanks,
     
    • KVL.JPG
      KVL.JPG
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  2. recca02

    Senior Member

    Apr 2, 2007
    1,211
    0
    for resistances encountered by traversing in direction of current drop + at the entering side and - at the other.
     
  3. snowfox

    Member

    Oct 21, 2007
    18
    0
    I second that... well put~
     
  4. agentofdarkness

    Active Member

    Oct 9, 2007
    42
    0
    After you have drawn all your voltage loops, go around the loop looking at each resistor and voltage source. If the current at a resistor is in the same direction as the voltage loop, it will be -IR. If they are in the opposite direction, it will be IR. For batteries, its the same thing except the direction of the current doesn't matter. If the voltage direction reaches to - terminal of the battery first, then it will be + EMF(voltage of the battery). If it reaches the + terminal first, then it will be -EMF.
     
  5. chesart1

    Senior Member

    Jan 23, 2006
    269
    1
    Are you having problems because the current source and the voltage source are in the same loop?
     
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