impedance at resonance

Discussion in 'Homework Help' started by cmp46, Jan 4, 2014.

1. cmp46 Thread Starter New Member

Jan 4, 2014
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Hi I am new to electric circuits and everything but I have a test coming up that covers this.

In a series AC circuit, XL = 2350 ohms, C = 0.005 µF, and R = 500 Ω. What is the
impedance at resonance?

I would just really like to know how to solve this. Thank you!

2. Jony130 AAC Fanatic!

Feb 17, 2009
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For series LCR circuit Zo at resonance is equal R.

cmp46 likes this.
3. shteii01 AAC Fanatic!

Feb 19, 2010
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Jony is right.

cmp46 likes this.

Jan 4, 2014
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5. crutschow Expert

Mar 14, 2008
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At resonance the capacitive reactance cancels the inductive reactance so the only impedance left is the resistance, as noted by the previous posters.

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6. cmp46 Thread Starter New Member

Jan 4, 2014
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well I also need help with two more questions:

A 10 mH coil has a resistance of 100 ohms. At what frequency does XL = R ?

When observing a 500 KHz square wave with an oscilloscope, what period would you expect to see? (For a full cycle)

Mar 6, 2009
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Feb 19, 2010
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9. cmp46 Thread Starter New Member

Jan 4, 2014
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I am sorry. I just don't even know how to work those problems out. I have been searching for information and I am still lost so I thought it would be better to ask people who know for an explanation.

10. shteii01 AAC Fanatic!

Feb 19, 2010
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No offense, but not being able to figure out wave period in the Age of Google is kinda pathetic.

Last edited: Jan 4, 2014
11. bountyhunter Well-Known Member

Sep 7, 2009
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When I was in school, the teacher was supposed to know.....

or use Google as somebody else suggested.

Apr 5, 2008
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