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90.
Which of the following is a valid Kirchoff Loop Equation?

A.   V1  -  I5R5  +   I3R3  =  0
B.   V2  -  I1R1  -  I6R6  =  0
C.   V1  -  I6R6  +  I2R2  -  I3R3  =  0
D.   V1  -  V2  -  I4R4  =  0

 

Kirchoff Loop Rules
    
1. The total voltage change in a loop = 0
   
2. If direction through a battery hits negative end (small line) then positive end (large line) it is positive, otherwise, it is negative.
3. If the direction through the loop is the same as the current direction, V = - IR; otherwise,
V = IR

      

V1  +  I5R5  -   I3R3  =  0                        A is wrong
V2  -  I1R1  -  I6R6  =  0                          B is correct           
V1  +  I6R6  -  I2R2  -  I3R3  =  0            C is wrong
V1  +  V2  -  I4R4  =  0                   
         D is wrong