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Phasor
A phasor (of phase vector), is a complex number representing a sinusoidal function whose amplitude A, angular frequency ω and initial phase θ are time-invariant.
Explanation
The phasor (or complex amplitude) is a vector in the complex plane from the origin, and written as
A eiθ
where
A Amplitude e Number e i Imaginary unit θ Phase
Example 1
The complex number z = 1 + i can be written as a phasor, because
so that