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According to the figure and the given loop equation, which expression represents Kirchhoff's Voltage Law for the circuit? 
A$V_1+V_2+V_3+V_4+V_5+V_6+V_7+V_s=0$
B$V_1+V_2+V_3+V_4+V_5+V_6+V_7-V_s=0$
C$V_s-(V_1+V_2+V_3+V_4+V_5+V_6+V_7)=0$ is impossible for a loop
D$V_1+V_2+V_3=V_4+V_5+V_6+V_7$
Answer & Solution
Correct answer: B. $V_1+V_2+V_3+V_4+V_5+V_6+V_7-V_s=0$
The page shows the loop relation as the sum of the element voltages minus the source voltage equals zero. So the correct algebraic statement is $V_1+V_2+V_3+V_4+V_5+V_6+V_7-V_s=0$. Option A has the wrong sign for the source.
