# Equivalent Resistance

1. Mar 1, 2008

### rootX

1. The problem statement, all variables and given/known data
Find equivalent resistance in:
http://img135.imageshack.us/img135/585/62083770ay3.jpg [Broken]

2. Relevant equations

3. The attempt at a solution
my
r_eq^-1 = (30+60)^-1+(40+10)^-1
this is wrong.
do i need to include 8 and 4 ohm resistors

Last edited by a moderator: May 3, 2017
2. Mar 1, 2008

### stewartcs

Based on your drawing your equation looks correct. What answer did you get?

You can check your answer against this equation's results:

$$R_{eq} = \frac{R_1 \cdot R_2}{R_1 + R_2}$$

R1 would be 90 since 30 and 60 are in series and R2 would be 50 for the same reason.

CS

Last edited by a moderator: May 3, 2017
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