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Apply the junction rule at point a in Figure 21.52.
Question Image
<b>Figure 21.52</b> A cicuit schematic.
Figure 21.52 A cicuit schematic.
Question by OpenStax is licensed under CC BY 4.0.
Final Answer

$I_3 = I_1 + I_2$

Solution Video

OpenStax College Physics Solution, Chapter 21, Problem 35 (Problems & Exercises) (0:31)

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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 <i>I3</i> going into it. So we have the total of all the currents going in of which there’s only one, so it’s <i>I3</i> equals the total of the currents coming out which is <i>I1</i> and <i>I2</i>. So there’s our Junction Rule written out separately.