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practice-final

# practice-final - 059:008 Electrical Circuits Spring 2012...

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059:008 Electrical Circuits Spring 2012 Exam I Name: 1. (12 pts) C i r c u i t + - P C = -15 W E 1 + - E 2 V 2 = 5 V I 2 I 1 (i) In 15 seconds, 60 Coulombs of charge flows through the element E 1 in the direction of the arrow. How much energy is required to move this charge? a) 4 Joules b) 12 Joules c) 75 Joules d) 300 Joules e) 900 Joules (ii) The power in the circuit connected to the two elements E 1 and E 2 is -15 Watts. If I 1 is a current flow as in the previous question (60 Coulombs every 15 seconds) what must the power in element E 2 be? a) -20 Watts b) -5 Watts c) 5 Watts d) 20 Watts e) 35 Watts + - 2I X E 1 E 3 + - E 2 I X + - + - 2 A P = 2 W 5 V 9 V 9 V (iii) What is the current I X in the circuit shown? a) -2.5 A b) -2 A c) 1.1 A d) 2 A e) 2.5 A (iv) What is the power in the dependent source? a) -10 W b) -5 W c) 4 W d) 5 W e) 10 W Page 1 of 8

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059:008 Electrical Circuits Spring 2012 Exam I Name: 4. (12 pts) 4 k Ω 6 k Ω 12 k Ω I S I T I 1 I 2 I 3 (i) If I 3 = 10 mA, what is the current I 1 ? a) 4 mA b) 6 mA c) 6.67 mA d) 15 mA e) 20 mA (ii) If I 3 = 10 mA as before and I S and I T are both positive, which of the following is true? a) I S supplies power and I T absorbs power b) I S absorbs power and I T supplies power c) Both I S and I T supply power d) Both I S and I T absorb power e) There is not enough information to determine R eq R 1 (6 k Ω) R 2 (12 k Ω) R 3 (18 k Ω) R 4 (24 k Ω) R 5 (12 k Ω) R 6 (12 k Ω) R 7 (6 k Ω) (iii) Circle ALL that are true for the circuit shown: a) R 1 and R 2 are in series b) R 2 and R 4 are in parallel c) R 2 and R 5 are in parallel d) R 3 and R 5 are in series e) R 4 and R 6 are in series (iv) The equivalent resistance R eq for the network is a) 2 b) 9 c) 15 d) 18 e) 20 Page 4 of 8
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