Kirchhoff's laws
- Kirchhoff's junction rule
The algebraic sum of currents in a network of conductors meeting at a point is zero.
\(\sum_{i=1}^^N\ I_i\ =0\) 
- Kirchhoff's loop rule
The directed sum of the potential differences (voltages) around any closed loop is zero.
\(\sum_{i=1}^^N\ V_i\ =0\) 