Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Current and resistors

  1. Mar 9, 2005 #1
    Cant quite get this one.
    What I think is that I3 and I1 add together to get I2
    and I found this equation V1+v2=E1-E2 and V3+V2=E3-E2 and I was substituting IR in for all the V's and I3+I1 where I2 comes in and making two equaitons and solving but no dice any tips? Thanks.
    _________/\R3\/l
    l l I3-> l
    E1 ^ E2 E3 R1 = 1.00 kΩ, R2 = 2.00 kΩ, R3 = 3.00 kΩ,
    l l R3 l E1=60.0V, E2 = 45.0 V and E3 = 70.0 V
    l I2 l l ok the e's are epslons V=IR epslon subs in for V
    l l l I did the best I could to show current direction
    l l l It was tough to draw let me know if your confused
    ---/\R1/\-------l Or if you kn know a better way to draw on this
    I1->
     

    Attached Files:

  2. jcsd
  3. Mar 9, 2005 #2
    Check your signs. v1+v2 = E2 - E1 and v3+v2 = E2-E3
     
  4. Mar 10, 2005 #3
    ok i kind of see how you get that but thats not my problem my problem is finding which currents to use where
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook