# RC Circuit Question - Inductive Reactance = Impedance?

Discussion in 'Homework Help' started by free1, Oct 5, 2011.

1. ### free1 Thread Starter New Member

Oct 5, 2011
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We just simulated a circuit in lab with a 100ohm resister connected to a 33mH inductor in series. It was powered by an oscillator supplying a steady 4vp-p. The point of the experiment was to change the frequency from 200hz-10000hz and monitor how frequency affects the inductor. One thing I cannot figure out though is why the inductive reatance equals the impedance of the circuit at 5000hz? Should the impedance also equal the inductive reatance at 200hz as well? If so, why? At 200hz the impedance and inductive reactance are very close but not equal. Any help is greatly appreciated. I am just starting to learn circuit analysis so please be patient with me. I am sure this is something simple but I just cannot figure it out.

Last edited: Oct 5, 2011
If you calculate the reactances of the coil at different frequencies using XL = 2∏fL , and (magnitude of) Z=√(R$^{2}$ + XL$^{2}$) you should see what is happening.