# Homework Help: Current electricity help please

1. May 30, 2007

### noofie

1. The problem statement, all variables and given/known data
Code (Text):

-------R1---------
l                   l                          R1=5 ohms
----  V=120            l                          R2= 11 ohms
-                   R2                        R3= 6 ohms
l                     l                          R4=8 ohms
l                     l                          R5=4 ohms
l              ------------
l              l            l
l              l            l
l              R3           R4
l              l            l
l              l           R5
l              ------------
l_____________l
Q: find the potential difference across the 4.0 ohm resistor

2. Relevant equations

3. The attempt at a solution
V= IR
V/ (R1+R2)

(V/(R1+R2)) / 2

((V/(R1+R2))/2) x ((1/R4)+(1/R5))^-1

Last edited: May 30, 2007
2. May 30, 2007

### G01

I'm sorry, I'd try to help if i can, but I can't understand your diagram??

3. May 30, 2007

### ranger

Use the code tags to preserve the formatting of your characters.

use [ CODE ] [ /CODE ]*

*no whitespaces.

Last edited: May 30, 2007
4. May 31, 2007

### Mentz114

Find the total resistance of the circuit, then the current I = V/Total R.

The voltage across the 4 ohm resistor is then 4*I.

R total = R1 + R2 + 1/(1/R3+1/(R4+R5))