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From the KVL equation in the figure, which statement is correct? 
AThe source voltage equals the sum of all resistor voltage drops
BThe source voltage must always be smaller than each individual drop
COnly the top branch voltages affect the loop equation
DThe loop contains no energy source
Answer & Solution
Correct answer: A. The source voltage equals the sum of all resistor voltage drops
Rearranging $V_1+V_2+V_3+V_4+V_5+V_6+V_7-V_s=0$ gives $V_s=V_1+V_2+V_3+V_4+V_5+V_6+V_7$. So the source rise balances the total drops in the loop.