2. 
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A phasor is a complex number that
represents the amplitude and phase angle of
a sinusoidal function.
It transforms a sinusoidal function from time
domain to the complex number domain
The IEEE Dictionary (IEEE 100) defines a
phasor as ‘‘a complex number.’’
Phasors are credited to electrical engineer
Charles Proteus Steinmetz (1865–1923)

4. 
Recall

6. 
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Capacitor - current leads voltage
Voltage leads current - Inductor