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Kirchhoff's rules apply to any electric circuit, DC or AC,
no matter how complex.
The rules are applied systematically as follows.
a Label currents ... I1
... I2 ... etc so that the junction
rule is satisfied.
b Mark starting points and loop directions.
c Write down voltage equations for each loop, remembering
that V=IR and that the leading end of a resistor is positive.
d Solve the set of linear simultaneous equations for
the unknown currents (by conventional or matrix methods). Initial
current directions are selected at random. If a current is in
the opposite direction the solution will be negative.
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