Electrical Engineering - RL Circuits - Discussion

Discussion :: RL Circuits - General Questions (Q.No.18)

18. 

When the frequency of the voltage applied to a series RL circuit is increased, the phase angle

[A]. decreases
[B]. increases
[C]. does not change
[D]. cannot be determined without values

Answer: Option B

Explanation:

No answer description available for this question.

Chip Tausch said: (Sep 27, 2012)  
As f ---> 0,
The phase < of the inductor approaches pi/2
The phase < of the resistor approaches 0

As f ---> infinity
The phase < of the inductor approaches 0
The phase < of the resistor approaches pi/2

So the phase over the resistor definitely increases, but the overall phase angle will depend on what the previous phase angle was before you started increasing the frequency.

Alaa said: (Nov 3, 2014)  
I can not understand this answer.

Can you provide us equations ?

Xyz said: (Jan 6, 2015)  
Phase angle = tan(inverse) [2pifL/R]. So f is increase then phase angle is increase.

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