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In the loop shown, which component is the voltage source? 
A$V_3$
B$V_5$
C$V_7$
D$V_s$
Answer & Solution
Correct answer: D. $V_s$
The figure explicitly labels the circular element as the voltage source, $V_s$. The other labels $V_1$ to $V_7$ refer to voltage drops or rises across circuit elements in the loop.
