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Using the junction shown in the figure, which equation correctly represents Kirchhoff's Current Law? 
A$I_1+I_2+I_3=I_4+I_5+I_6$
B$I_4+I_5+I_6=I_1+I_2-I_3$
C$I_1+I_4=I_2+I_3+I_5+I_6$
D$I_1+I_2+I_4+I_5=I_3+I_6$
Answer & Solution
Correct answer: A. $I_1+I_2+I_3=I_4+I_5+I_6$
From the arrows in the figure, $I_1$, $I_2$, and $I_3$ are directed toward the junction, while $I_4$, $I_5$, and $I_6$ are directed away from it. Hence, by Kirchhoff's Current Law, $I_1+I_2+I_3=I_4+I_5+I_6$.
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