# RLC Calculations - - I'm given the rectangular coordinates of an RL series circuit which is: 15+j12

Thread Starter

#### r-persaud5000

Joined Nov 22, 2016
3
Hi,

My question is similar but I don't have the frequency. I'm given the rectangular coordinates of an RL series circuit which is: 15+j12.56.

I understand that XL = 12.56 and that the formula for XL = (2pi)F(L). I also understand the mechanics of how to perform the calculations. I just don't know how to find the frequency when I'm not given time or omega.

Any help would be greatly appreciated. Thanks!!

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#### Motanache

Joined Mar 2, 2015
540
I understand that XL = 12.56 and that the formula for XL = (2pi)F(L).
If you know L you can calculate f.
If you know f you can calculate L.

Or maybe, the problem statement give us more details that you have not been mentioned here.

#### MrAl

Joined Jun 17, 2014
11,272
Hi,

My question is similar but I don't have the frequency. I'm given the rectangular coordinates of an RL series circuit which is: 15+j12.56.

I understand that XL = 12.56 and that the formula for XL = (2pi)F(L). I also understand the mechanics of how to perform the calculations. I just don't know how to find the frequency when I'm not given time or omega.

Any help would be greatly appreciated. Thanks!!

Moderator's Note:
Please don't hijack other member's thread, now you have your own.
This thread was split from:
RLC Calculations
http://forum.allaboutcircuits.com/threads/rlc-calculations.47710/#post-1090066
Hi,

I assume you want to get the frequency from the complex impedance.

Do you know how to calculate the complex impedance of an RL series circuit?
Do you know that w=2*pi*f where f is the frequency?

If so, then you can calculate first 'w' and then the frequency, because:
Z=R+j*w*L

See if you can solve this now.

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