EE 40 Homework #3 Due Tuesday, February 18, 2003 In drop box before class, in 477 Cory before 7PM, or at beginning of review session Highly suggested: Make a copy of your answers to this homework to compare to the solutions Pass/Fail Grading: 30 Points for reasonable effort, 0 points given only if really off-track Problem 1: Use nodal analysis to find the power absorbed by the 25 V voltage source. 35 Ω150 Ω 40 Ω50 Ω25 V2 A Problem 2: Use nodal analysis to find the power absorbed by the dependent current source. +-80 Ω40 Ω20 Ω1 Ω 4 Ω2 Ω20 V35 I13.125 V1+ V1 -I1 Problem 3: Find the Thevenin equivalent with respect to terminals a and b. 40 V12 Ω 20 Ω40 Ω25 Ω 40 Ω7.5 A5 AbaProblem 4: Find the Thevenin equivalent with respect to a and b. +-6.5 I110 Ω 12 Ω25 Ω5 Ω50 ΩabI1 Problem 5: Suppose I have a circuit in a box, and I can’t see exactly what’s inside, but I do know that the circuit contains only resistors, constant independent voltage and current sources, and linear dependent sources. The controlling voltages and currents for the dependent sources are also in the box. I perform one experiment: When I attach a 5 V battery to the circuit, I measure a 200 mA current in the direction shown. (The ammeter is working correctly!) The internal resistance of the battery is 3 Ω, and the internal resistance of the ammeter is 1 Ω. Can I find the Thevenin equivalent of the circuit in the box with this information? If yes, find the Thevenin equivalent. If no, explain why it is not possible to find the equivalent with this information. Problems adapted from Electric Circuits by Nilsson and Riedel, the supplemental text for EE 40. 5 V DMM 200 mA
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