midterm

# midterm - MAE140 Linear Circuits Fall 09 Midterm November...

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MAE140 - Linear Circuits - Fall 09 Midterm, November 10 Instructions (i) This exam is open book. You may use whatever written materials you choose, including your class notes and textbook. You may use a hand calculator with no communication capabilities (ii) You have 70 minutes (iii) Do not forget to write your name , student number , and instructor B + - 10 V 0.5 A 10 40 20 10 A (a) Question 1. A v S i S B D C R 2 R 4 R 3 R 1 i 1 i 2 (b) Question 2. Figure 1: Circuits for questions 1 and 2. 1. Equivalente Circuits Part I [4 points] Use source transformations and association of resistors to find the Thevenin equiva- lent to the circuit in Fig. 1(a) as seen from terminals A and B. Part II [4 points] A classmate was arguing with you that one would “extract” the most power out of this circuit by connecting a very small resistance between terminals A and B. You argued that he/she was wrong and that a 20 resistor would be a better choice. Who is right and why?

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