says: "the sum of the currents that go into a knot is equal to the sum of the currents that move away from same knot. "
Remember the maxim of Physics than the sum of all forces is zero? As with the first law of Kirchhoff quite the same.
In this picture we can see that there are two nodes: A and B.
This graph can be seen more clearly. Both I1 and I2 are close to the knot we call A, however, I3 moves away from the knot. So, the KCL is:
Note: In knot B happen in reverse, ie I3 enters the knot B, while that I1 I2 and leave the knot B.
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