## 9277 #81

### Re: 9277 #81

They are asking for a maximum steady state current amplitude. That implies it has settled to a "natural frequency" or resonance.

Here ... let wikipedia explain it ...

http://en.wikipedia.org/wiki/RLC_circuit

Here ... let wikipedia explain it ...

http://en.wikipedia.org/wiki/RLC_circuit

Last edited by t2kburl on Fri Apr 01, 2011 6:21 pm, edited 2 times in total.

- WhoaNonstop
**Posts:**853**Joined:**Mon Sep 21, 2009 1:31 am

### Re: 9277 #81

What nationality is this driver?wenyang wrote:In the RLC circuit with a driver, I first find a relation between the amplitude and the frequency. Then I take derivative and find the frequency equals to (D) when amplitude is maximized. But ETS gives (C). Anyone knows why?

-Riley

### Re: 9277 #81

"Step bee-hine my yerrow rine." (San-Francisco bus driver, c. 2011)WhoaNonstop wrote:What nationality is this driver?wenyang wrote:In the RLC circuit with a driver, I first find a relation between the amplitude and the frequency. Then I take derivative and find the frequency equals to (D) when amplitude is maximized. But ETS gives (C). Anyone knows why?

-Riley

### Re: 9277 #81

I am sorry? The driver is just oscillating potential. However, if you are asking literally what nationality is the driver? I have no idea, maybe made in Japan or Germany? lolWhoaNonstop wrote:What nationality is this driver?wenyang wrote:In the RLC circuit with a driver, I first find a relation between the amplitude and the frequency. Then I take derivative and find the frequency equals to (D) when amplitude is maximized. But ETS gives (C). Anyone knows why?

-Riley

### Re: 9277 #81

Man, the thing is that I derive the formula and it is (D). If it is (C), then it seems that the resistance has no effect of the amplitude, which is not true. The resistance acts as a damping factor. I bet ETS is wrong.t2kburl wrote:They are asking for a maximum steady state current amplitude. That implies it has settled to a "natural frequency" or resonance.

Here ... let wikipedia explain it ...

http://en.wikipedia.org/wiki/RLC_circuit