Homework Help: Need help on series circuts

1. May 10, 2010

lazyboy92

_________300ma__
|........................ |
|........................ ∏ L1
_ +......................| R1
9v.......................|.............................. ignore the dots in the middle
- -...................... ∏ L2
|..........................| 2R
|________________|

Find the:

The value of R

The total resistance

and any other answers this question might yield

Thanks a lot.

only question i got wrong in a test. :(

Last edited: May 10, 2010
2. May 10, 2010

drkidd22

300ma = 9/R
Total Resistance = 30Ohms

30/2 = 15ohms each resistor?

3. May 10, 2010

Redbelly98

Staff Emeritus
I am redrawing the circuit, hopefully this is easier to look at:
Code (Text):
________300ma__
|               |
|               ∏ L1
_ +             |  R1
9v              |
- -             ∏ L2
|               |  2R
|_______________|
Are you sure you reproduced the question accurately? It's weird to have those inductors in there, without for example a switch that closes at time t=0 or something along those lines. Also, is the 300 mA the current at some specific time, or after a long time has passed?

Also, did you mean to say 2R or R2 in the figure?

If R were 300 ohms, then the current would be 9/300≠0.3A.

Last edited: May 10, 2010
4. May 17, 2010

drkidd22

I mean 30 Ohms, the O makes it look like a 300