Every cannot use commutation of equivalent of resistor series-parallel connection to change brief circuit, call complex circuitry commonly. To complex circuit we can use KCL and KVL derivation to give all sorts of analysis methods, law of spur track electric current is among them one of.

　

Law of spur track electric current:

　

Complex to any circuit, if be unknown quantity with electric current of each spur track, applied KCL and KVL row write equation, must the make choice of on preexistence circuit graph is very sealed the referenced direction of spur track electric current and voltage or electromotive force.

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