260 Engr -- Circuits & Devices - Test 2 March 26, 2008 Name: _____________________________ Part 2: Solve each of the following problems. 1. Find the current in the 2- resistor using superposition.
2. Use source transformation to find ix . Note: After source transformations, you are allowed to use only one KVL equation. Show all steps
As shown in Fig. (a), we transform the dependent current source to a voltage source,
15 60V
+ -
10 50
5ix
-+
15
40
60V
+ -
50
50
0.1ix
(a
(b)
In Fig. (b), 50||50 = 25 ohms. Applying KVL in Fig. (c), -60 40ix + 2.5ix = 0, or ix = 1.6 A
ix
+ -
15
25
- +
60V
ix
2.5ix
3. For the given circuit: a. Find the Thevenin equivalent circuit as seen by RL. b. What value of resistor RL should be connected to to receive maximum power? c. What is the maximum power received by RL.
(c)
4. For the circuit shown:
a) Find the Thevenin equivalent for the circuit shown with respect to terminals a-b. The current ix has units of mA. b) If a load resistor RL = 2 is connected to terminals a-b, find the resulting current in this resistor.
5. For Rf = 20 k, find vo.