So, if frequency increases, inductive reactance X L also increases and if inductive reactance increases, total impedance of circuit also increases and this leads to variation in phase angle θ with frequency. The formula for inductive reactance is X L = 2πfL. The resistance is independent of frequency so, if frequency increases or decreases, resistance remains constant. The base of this impedance triangle represents resistance. The above diagram shows the impedance triangle. Variation of Impedance and Phase Angle with Frequency The electrical power factor cosθ is defined as ratio of the true power to apparent power. Power triangle for series RL circuit is shown below, So, total power in series RL circuit is given by adding the power dissipated by the resistor and the power absorbed by the inductor.
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