Homework Help: Can Somebody Check My Work For Me? Circuits

1. Feb 21, 2010

mmmboh

Hi here is the problem:

What I did was Z=[(XL-Xc)2+R2]1/2 = 5 ohm

and then V/R = I = 110(2)1/2/5=31.1A

For part B) I did V=L(di/dt)=-Lwsin(wt), and the peak amplitude is when sin(wt)=-1 and is 377V.

Can someone tell me if what I did is right, or what is wrong?

Thanks.

Last edited: Feb 21, 2010
2. Feb 21, 2010

kuruman

Your impedance formula is incorrect. Also, what value did you use for ω?

3. Feb 21, 2010

mmmboh

Sorry I meant +R not -R..but I used the right formula when calculating the value of 5. For w I used 2(pi)f=377 Hz

4. Feb 21, 2010

kuruman

Looks OK then. I assume that you plugged in the numbers and got XC and XL correctly.

5. Feb 21, 2010

mmmboh

I did (wL-1/(wC)^2 for XL-Xc

6. Feb 21, 2010

kuruman

That's fine. I hope you plugged in correctly.