midterm2_soln - ESE123 Midterm Exam 2 Fall 2009 Name:_ Show...

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ESE123 Midterm Exam 2 Fall 2009 Name:________________________________ ID Number: __________________________ Show your work Don’t forget units For questions 1) through 4) consider a power transformer with a primary winding of 400 turns and a primary side inductance of 1.81 henries. The secondary winding has 21 turns. The transformer can be modeled with a secondary side Thévenin resistance of 0.15 ohm. The primary is connected to a 120 Vrms 60 Hz ac source. You may assume perfect magnetic coupling between the primary and secondary sides. 1) What is the rms open circuit output voltage? ) ( 30 . 6 2 120 2 400 21 1 2 1 2 rms V V V V V N N = = = 2) What is the inductance of the secondary winding? mH L L L N N V V L L 99 . 4 2 000 160 441 81 . 1 2 400 21 81 . 1 2 1 2 1 2 1 2 = = = = = 3) What secondary current would you expect if a 1 ohm resistor is connected across the secondary winding? We must account for the series resistance of the Thévenin resistance in the secondary: ) ( 478 . 5 ) 15
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midterm2_soln - ESE123 Midterm Exam 2 Fall 2009 Name:_ Show...

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