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## Homework Statement

Find R_AB in the network. Look at attached file "Problem"

## Homework Equations

R_S= R1+R2+R3+....Rn (for series resistors)

1/RP= 1/R1 + 1/R2 + 1/R3 + 1/Rn.... (for parallel resistors)

V=IR (ohm's law)

## The Attempt at a Solution

Look at attached file "Problem Attempt"

I know I'm probably not looking at these circuits the correct way, because each time I try to solve these problems, I find different equivalent resistances depending on the order by which I use the series resistor and parallel resistor formula. I really want to know the correct way to read the diagram, because that is half the battle, and it would guide my calculations a lot more smoothly.

I'm also stuck. What do I do with that 9ohms?

#### Attachments

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