Find I1 in the network


Find I_1 in the network.

Find I1 in the network

Image from: Irwin, J. David., and R. M. Nelms. Basic Engineering Circuit Analysis, Tenth Edition. N.p.: John Wiley & Sons, 2010.

Solution:

We will write Kirchhoff’s current law for nodes A and B (which were arbitrarily chosen). ¬†(Forgot¬†Kirchhoff’s current law?)

Node B:

I_2=6+4

(here, we assigned I_2 as the current coming into the node)

I_2=10mA

Node A:

I_1+I_2=20

I_1=20-I_2

I_1=20-10

I_1=10mA

This question can be found in Basic Engineering Circuit Analysis, 10th edition, chapter 2, question 2.10.

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