**Unit 2**

1270 PRACTICE EXAM

1. (a) (10 points)

For the circuit shown, write three independent equations for the node voltages v1, v2, and v3. The quantity ix must not appear in the equations.

(b) (10 points)

Make a consistency check on your equations by setting one or more resistor values to 0 or ´ and setting other sources and resistor to values for which v1, v2, and v3 are obvious.

(c) (10 points)

For the circuit shown, write three independent equations for the three mesh currents i1, i2, and i3. The quantity v1 must not appear in the equations.

(d) (10 points)

Make a consistency check on your equations by setting one or more sources to zero and using convenient resistor and source values.

2. (30 points)

Find the Thevenin's equivalent circuit at terminals a-b. Hint: Use node voltage method to find vth.

3. (30 points)

Calculate the power furnished or absorbed by the 30V voltage source, and state whether it is furnished or absorbed.