Relating currents and resistance

Discussion in 'Homework Help' started by s110, Jan 30, 2007.

  1. s110

    Thread Starter New Member

    Jan 30, 2007
    I have attached a picture of the problem.
    Part 1: Use Kirchhoff's current law to determine the unknown currents in the circuit shown. Assume that I0=-2A, I1=-4A, Is=8A and Vs=12V.
    Part 2: Use Ohm's law to find the resistances R1, R2, R3, R4 and R5 if R0= 2 ohms. Assume R4=(2/3)R1 and R2=(1/3)R1.

    My work:
    For the first part I set up the equations:
    I0+I1+Is-I3=0 I found I3=2A.
    I0+I1+I2=0 I found I2=6A.

    For the second part I attempted to use R=V/I. I know that Vs=12. But when I applied this I got:
    R1=(12/-4)=-3 ohms
    R2=(12/6)=2 ohms
    2 is not (1/3)3 [R2=(1/3)R1]

    I was wondering where I messed up in the 1st part and/or 2nd part.
  2. Distort10n

    Active Member

    Dec 25, 2006
    Have you confirmed your equations or do you still need help with this?