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    quantitykind:ElectricCurrentPhasor
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    Electric Current Phasor
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    http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=31891
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    http://en.wikipedia.org/wiki/Phasor_(electronics)
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    http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=131-11-26
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    When \(i = \hat{I} \cos{(\omega t + \alpha)}\), where \(i\) is the electric current, \(\omega\) is angular frequence, \(t\) is time, and \(\alpha\) is initial phase, then \(\underline{I} = Ie^{ja}\).
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    \(\underline{I}\)
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    "Electric Current Phasor" is a representation of current as a sinusoidal integral quantity using a complex quantity whose argument is equal to the initial phase and whose modulus is equal to the root-mean-square value. A phasor is a constant complex number, usually expressed in exponential form, representing the complex amplitude (magnitude and phase) of a sinusoidal function of time. Phasors are used by electrical engineers to simplify computations involving sinusoids, where they can often reduce a differential equation problem to an algebraic one.