Kirchhoff's Laws

KCL: currents into a node sum to zero. KVL: voltages around a loop sum to zero.

Beginner

Kirchhoff's Current Law (KCL) — conservation of charge at a node:

$\sum I_{in} = \sum I_{out}$

Kirchhoff's Voltage Law (KVL) — conservation of energy around any closed loop:

$\sum V = 0$

Together with Ohm's law these two laws let you analyse any linear circuit. See Electrical → Circuit Analysis for nodal and mesh methods.

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