A phasor represents a time-varying quantity in terms of both magnitude and direction.

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A phasor is a complex number used in engineering, especially in electricity and electronics, to represent a sinusoidal function whose amplitude (magnitude), angular frequency, and initial phase are time-invariant. It simplifies the analysis of systems with sinusoidal signals by representing them in terms of magnitude and phase angle (direction).

A Phasor Represents a Time-Varying Quantity in Terms of Both