# Finding a voltage in a circuit with only resistors and current sources

• Engineering

## Homework Statement Find V0 in the circuit.

## Homework Equations

Kirchhoff's Current Law: All currents entering a node must sum to zero.
Kirchhoff's Voltage Law: All voltages around a loop must sum to zero.

## The Attempt at a Solution

So far, I have taken the top of the center branch to be a node with five currents entering/leaving it. Using Kirchhoff's Current Law, I have done:

0 = 2Vy + (3Vx / 3Ω) + 6A - (2Vy / 4Ω) - 4Vx

I assumed that the voltage across the 2Ω resistor in the second branch from the right was also Vy, and I assumed that the voltage across the 2Ω resistor in the second branch from the left was 2Vx. I know this because I know that the current is constant within each branch.

Solving the equation for Vx, I got:

Vx = (1/2)Vy + 2A

At this point, though, I'm confused about what to do. I've thought of using Kirchhoff's Voltage Law using the loop formed by the two resistor branches (so basically ignoring all the branches that current sources in them), but even if I do that and make the substitution I derived from Kirchhoff's Current Law, I don't know how I'm supposed to get V0 from doing that. Am I supposed to find the current in those two branches and then just add up the voltage drops across the four resistors? If so, I'm not sure how to find the currents. Am I supposed to find the voltages across the current sources?

I would really appreciate any help.

Thank you.