Power Angle

Power Angle (

ϕ

)

Difference between phase of phasor representations of voltage and current.

ϕ = θ_{v} - θ_{i}

Unit: degree ( $^{\circ}$ ) or radian (rad)

Properties

Power Factor	Power Angle	Phase Relation	Load
Unity	$ϕ = 0$	$V$ and $I$ are in phase	Purely Resistive
Lagging	$ϕ > 0$	$I$ lags $V$	Inductive
Leading	$ϕ < 0$	$I$ leads $V$	Capacitive
Zero	$ϕ = \pm 90^{\circ}$	$V$ and $I$ are orthogonal	Purely Reactive