Engineering RL Circuit - Problem finding Unknown Inductor

AI Thread Summary
The discussion revolves around finding the unknown values of voltage across the inductor (VL), inductive reactance (XL), and inductance (L) in an RL circuit. The user has calculated the current (I) as 5 mA and the impedance (Z) as 40 kΩ but is unsure how to derive the other values. A key point made is that the impedance is a complex quantity, and the relationship |Z| = √(R² + (ωL)²) can be used, where ω is defined as 2πf. The user initially expressed confusion about using ω but later acknowledged the correct formula. The conversation emphasizes the importance of understanding the relationship between impedance, resistance, and inductance in AC circuits.
Brad1983
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Here is the circuit:
http://img840.imageshack.us/f/60205514.png/

I need to find:
I
Z
VL - Voltage on Inductor
XL
L

I have I and Z but I can not figure out VL, XL, and L. This is what I have for I and Z:
-----------------------------------------------
a.)
I= V_R / R = 170 V / 34 kΩ = 5 mA
b.)
Z = V_s/I = 200 V / 5 mA = 40 kΩ
------------------------------------------------

I know XL = 2 x pi x f x L

This is where I am stuck.
 
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Your Z in b.) is the magnitude of the impedance (impedance is a complex quantity). So write:

|Z| = \sqrt{R^2 + (\omega L)^2}

Does that help?
 
gneill said:
Your Z in b.) is the magnitude of the impedance (impedance is a complex quantity). So write:

|Z| = \sqrt{R^2 + (\omega L)^2}

Does that help?

not sure because we do not use OMEGA.
 
ω = 2πf
 
gneill said:
ω = 2πf

oh I did not know that. We do use 2*pi*f. Thanks gneill
 

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