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 25 V 50 2A 40 Use nodal analysis to find the power absorbed by the dependent current source Problem 2 150 35 I1 2 20 Problem 3 V1 1 4 40 20 V 80 I1 3 125 V1 Find the Thevenin equivalent with respect to terminals a and b 5A 12 20 25 40 V 40 40 a b 7 5 A Problem 4 Find the Thevenin equivalent with respect to a and b 10 12 a 5 I1 50 25 6 5 I1 b 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 and the internal resistance of the ammeter is 1 5V 200 mA DMM 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
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