AC Fundamentals, Circuit and Circuit Theory
A phasor is

A colored tag or band for distinction between different phases of a 3-phase supply
A line which represents the magnitude and phase of an alternating quantity
A line representing the magnitude and direction of an alternating quantity
An instrument used for measuring phases of an unbalanced 3-phase load

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AC Fundamentals, Circuit and Circuit Theory
Poor power factor

Overloads alternators, transformers and distribution lines
Reduces load handling capability of electrical system
All of the listed here
Results in more power losses in the electrical system

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