What is phasor ?

Explanation

Phasor : A sinusoidal alternating voltage (or current) can be represented by a vector which rotates about the origin in anti-clockwise direction at a constant angular velocity `omega.` Such a rotating vector is called a phasor. A phasor is draw in such way that
i. the length of the line segment equals the peak value `V_(m)("or current")`
ii. its angular velocity `omega` is is equal to the angular frequency of the alternating voltage (or current)
iii. the projection of phasor on any vertical axis gives the instantaneous value of the alternating voltage (or current)
iv. the angle between the phasor and the axis of reference (positive x-axis) indicates the phase of the alternating voltage (or current).
The notion of phasor is introduced to analyse phase relationship between voltage and current in different AC circuits.
Phasor diagram
The diagram which shows various phasor diagram.