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