Ohm's Law(sometimes phrased in the I=E/Z form to use Z to emphasize impedance rather than pure resistance)
John, i've never seen Ohm's law used in any AC circuite analysis.. Usually for AC circuit analyses the minimum math required is algebra, and more likely deferential calculus, due to the vector calculations required.. there are constantly changing variables of the inductance and capacitance within the circuit, Ohm's law is not sophisticated enough to do the calculations.
Here is a quick example of the differences that i am talking about, notice all of the resistances have vectors associated with them. Ohm's law has no way at all of taking angle vectors into account. it is to simple of an eqn intended to be used for a static DC circuit.
http://www.freeclassnotesonline.com/Circuit-Impedance-Analysis-Exam-1.php
