Hello,

I'm having problems with this circuit. I'm trying to solve this problem, but I'm stuck right now. Okay, well, I'm trying to figure out if this is a Parallel RLC or a Series RLC (we have not cover series + parallel RLC circuits on my class). Seems to me that it is a series+parallel RLC, tho.

The circuit is on the picture. First, I turn off the sources, and try to find the equivalent resistence. What I do is:

R12 = (R1 * R2) / (R1 + R2) = 3/2

R123 = R12 + R3 = 11/2

Now, how can I add R4 to R123? It doesnt seem to be in series, or parallel. Am I doing something wrong? Please help, I know this is a stupid/easy question, but bleh, I don't know what I'm doing wrong. Unless, this is a series + parallel RLC circuit?

Sadly, I can't continue doing the exercise, 'cause of this little problem. Can someone help me?

Any help will be greatly appreciated.

~wiz0r

 

Hello,

I'm having problems with this circuit. I'm trying to solve this problem, but I'm stuck right now. Okay, well, I'm trying to figure out if this is a Parallel RLC or a Series RLC (we have not cover series + parallel RLC circuits on my class). Seems to me that it is a series+parallel RLC, tho.

The circuit is on the picture. First, I turn off the sources, and try to find the equivalent resistence. What I do is:

R12 = (R1 * R2) / (R1 + R2) = 3/2

R123 = R12 + R3 = 11/2

Now, how can I add R4 to R123? It doesnt seem to be in series, or parallel. Am I doing something wrong? Please help, I know this is a stupid/easy question, but bleh, I don't know what I'm doing wrong. Unless, this is a series + parallel RLC circuit?

Sadly, I can't continue doing the exercise, 'cause of this little problem. Can someone help me?

Any help will be greatly appreciated.

~wiz0r

if you remove the voltage source by a short and the current source by an open circuit, thus remove them, then R4 is in series with R123.

 

thanks alot, mike.

Now I know that R4 is in series with R123. But, I supposed I did something wrong before that.

the α(series) = Req / (2*L)

which according to our professor, α(series) should be 0.5.

according to my calculations;

Req = R123 + R4 = 15/2

therefore;

α(series) = (7.5) / (2*2) = 1.875

Obviously, 0.5 != 1.875

So, can anyone please tell me what am I doing wrong, or where is my mistake? anyone?

again, any help will be greatly appreciated.

EDIT: Well, I supposed I did a little mistake when I drew the circuit. The closed switch should look like .---->. instead of having that 45 angle. I don't know if it matters or not, so yea..

 

mm, well, i figured out what was wrong.

since the switch is closed, i need it to open it to find the equivalents R, L, and C to check if its an series RLC or parallel RLC.

i opened the switch, and took out the sources, everything cancels out, and i'll have only the rightmost loop with the 2 ohm resistance, 2H inductance, and 1F capacitance.

anyway, could somone tell me if im right or not?