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October 20, 2014

Homework Help: Physics DC Circuit

Posted by Bobby on Wednesday, March 26, 2008 at 5:12pm.

A
|-----2 ohm r-----------2 ohm r--|
| | |
___ 5 ohm r 3 ohm r
- | |
| ___ _
2 ohm r - ___
| | |
| I3 |
| | |
|-----<I1<---------------<I2<----|
B
Hopefully my drawing came out right because I can't find a way to attach the picture of the circuit.
Key:
2 ohm r= 2 ohm resistor
I1, I2, and I3 are currents at three branches. (I1 and I2 are to the left, I3 is downward)
Batteries marked with their usual symbol have voltages (left to right) 12 V, 7 V, 13 V.

1) Find the currents in the three branches.
2) What is the change in potential V_A-V_B?

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