9277 #81

wenyang
Posts: 6
Joined: Sun Apr 04, 2010 11:04 pm

9277 #81

Postby wenyang » Fri Apr 01, 2011 6:03 pm

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?

t2kburl
Posts: 101
Joined: Thu Dec 23, 2010 2:52 pm

Re: 9277 #81

Postby t2kburl » Fri Apr 01, 2011 6:12 pm

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

User avatar
WhoaNonstop
Posts: 851
Joined: Mon Sep 21, 2009 1:31 am

Re: 9277 #81

Postby WhoaNonstop » Fri Apr 01, 2011 6:13 pm

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?


What nationality is this driver?

-Riley

tady
Posts: 81
Joined: Sun Nov 07, 2010 11:37 pm

Re: 9277 #81

Postby tady » Fri Apr 01, 2011 6:15 pm

WhoaNonstop wrote:
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?


What nationality is this driver?

-Riley


"Step bee-hine my yerrow rine." (San-Francisco bus driver, c. 2011)

wenyang
Posts: 6
Joined: Sun Apr 04, 2010 11:04 pm

Re: 9277 #81

Postby wenyang » Fri Apr 01, 2011 8:24 pm

WhoaNonstop wrote:
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?


What nationality is this driver?

-Riley


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? lol

wenyang
Posts: 6
Joined: Sun Apr 04, 2010 11:04 pm

Re: 9277 #81

Postby wenyang » Fri Apr 01, 2011 8:27 pm

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


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
Posts: 101
Joined: Thu Dec 23, 2010 2:52 pm

Re: 9277 #81

Postby t2kburl » Fri Apr 01, 2011 9:07 pm

R is a constant




Return to “Problems, Solutions, and Discussion”

Who is online

Users browsing this forum: No registered users and 2 guests