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AC CIRCUIT ANALYSIS

AC circuit analysis http://fourier.eng.hmc.edu   Operations on sinusoidal variables based on the trigonometric identities are in general lengthy and tedious. The phasor method can convert such sinusoidal variables to vectors in complex plane and thereby simplify the operations. A sinusoidal time function can be considered as the real (or imaginary) part of a rotating vector in the complex plane. If two sinusoidal functions have the same frequency , i.e., they are rotating at the same rate, their relative positions with respect to each other are fixed independent of . Therefore the vectors can be considered as static instead of rotating if observed from a reference frame rotating at the same frequency as the vectors. An operation of two sinusoids can be carried out on their phasors, and the resulting phasor can then be converted back to a sinusoidal time function by taking the real part of the phasor now assumed to be rotating. All about AC circuits http://www.allaboutcircuits.com   As