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Using the junction shown in the figure, which equation correctly applies Kirchhoff's Current Law? 
A$I_4 + I_5 + I_6 = I_1 + I_2$
B$I_1 + I_2 + I_3 = I_4 + I_5 + I_6$
C$I_1 + I_4 = I_2 + I_3 + I_5 + I_6$
D$I_1 + I_2 + I_3 + I_4 + I_5 + I_6 = 0$
Answer & Solution
Correct answer: B. $I_1 + I_2 + I_3 = I_4 + I_5 + I_6$
In the figure, $I_1$, $I_2$, and $I_3$ enter the node and $I_4$, $I_5$, and $I_6$ leave it. By Kirchhoff's Current Law, total entering current equals total leaving current, giving $I_1 + I_2 + I_3 = I_4 + I_5 + I_6$.
