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Transcript
King Fahd University of Petroleum and Minerals Department of Electrical Engineering EE 201 Electric Circuits I, Major Exam I Monday, 19 March 2007 6:30 pm – 8:00 pm Name: ID: Section: Instructor: Dr. Yahya Al-Harthi Problem Score 1 2 3 Total Good luck! Out of 1. Find the equivalent resistance Rab for the following circuit. 1 2 1 1 3 3 5 2 6 3 a b 1 4 10 9 2. Ali has four devices (A, B, C, and D) which should sit on the board and be connected to the voltage source to function. These devices have the following specifications: Internal resistors: RA RB RC RD Needed Voltages: VA 2VB VC 2VD VS (a) Draw the connection of these devices (assume the devices are square boxes). (b) If VS 10V and RB 2 , what is the value of the current going through device B? Vs board 3. For the circuit shown below: (a) Use mesh-current analysis to write the equations of the currents given the speakers' internal resistors are: R1 , R2 , R3 , and R4 . (b) If R1 R2 R3 R4 2 , I 2 1 A , and Vs 2 V find the values of the currents. (c) If we want to replace the voltage source with a current source while still keeping the values of the currents in part (b), what should be the value of this current source? 1 Vs 2 Is DC 3 4
