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If a single-loop circuit has voltage drops of $2\,\text{V}$, $3\,\text{V}$, and $5\,\text{V}$ across its elements, then the source voltage required by Kirchhoff's Voltage Law is:

A$5\,\text{V}$
B$8\,\text{V}$
C$10\,\text{V}$
D$15\,\text{V}$
Answer & Solution
Correct answer: C. $10\,\text{V}$
By KVL, total rises equal total drops in a closed loop. The total drop is $2+3+5=10\,\text{V}$, so the source must supply $10\,\text{V}$.
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