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A Question about Kirchoff's Voltage Law

  1. Oct 13, 2013 #1
    Hello Guys

    My Question about Kirchoff's Law is : why in this Example
    we considered that E2 is a Voltage Drop not a Voltage Rise ??

    i mean why we didn't say that : +E2-V1-V2+E2=0 ???


    0aibQEq.png


    and Thanks Guys :)) !!
     
  2. jcsd
  3. Oct 13, 2013 #2

    D H

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    It's because the loop has a direction. In this case, the loop is clockwise, making E1 positive but E2 negative.
     
  4. Oct 14, 2013 #3
    Pick a direction for your analysis. Assign a sign to all the voltage rises, and the opposite sign to the voltage drops. The sum of all the voltage rises =the sum of all the voltage drops around the circuit.

    In your example, the current loop is clock wise, so the current flows into the negative side of E1 (voltage rise), and into the positive side of E2 (voltage drop).
     
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