Apply the junction rule at point a in Figure 21.55.
<b>Figure 21.55</b> A cicuit schematic.
Figure 21.55 A cicuit schematic.
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Final Answer

I3=I1+I2I_3 = I_1 + I_2

Solution video

OpenStax College Physics for AP® Courses, Chapter 21, Problem 35 (Problems & Exercises)

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Video Transcript
This is College Physics Answers with Shaun Dychko. The Junction Rule says that all the currents going into a point equals the sum of all the currents leaving that point or that junction. And so this junction here has a current I3 going into it. So we have the total of all the currents going in of which there’s only one, so it’s I3 equals the total of the currents coming out which is I1 and I2. So there’s our Junction Rule written out separately.