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Which of the following is a correct Kirchhoff's Voltage Law equation for the loop shown in the notes? 
A$V_1 + V_2 + V_3 + V_4 + V_5 + V_6 + V_7 - V_s = 0$
B$V_s + V_1 + V_2 + V_3 + V_4 + V_5 + V_6 + V_7 = 0$
C$V_s = 0$
D$V_1 + V_2 + V_3 = V_4 + V_5 + V_6 + V_7$
Answer & Solution
Correct answer: A. $V_1 + V_2 + V_3 + V_4 + V_5 + V_6 + V_7 - V_s = 0$
For the shown loop, the source provides a rise while the circuit elements contribute drops. Therefore the algebraic sum is written as the sum of drops minus the source voltage equal to zero: $V_1 + V_2 + V_3 + V_4 + V_5 + V_6 + V_7 - V_s = 0$.
