Kirchhoff's Current Law

what is node?

A node is any connection point of two or more circuit elements.

Kirchoff's current law:

The sum of the currents leaving any node equals the sum of the currents entering that node.

or

The algebraic sum of all currents into any node equals zero.

mathematically,

i1 + i4 = i2 + i3


or
\sum_{k=1}^n I_k = 0







Series Connection:
Two or more elements are in series when each node connects just two elements.

Also that elements in series carry the same current.
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