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Unformatted text preview: 1 CHAPTER 2 Solutions for Exercises E2.1 (a) R 2 , R 3 , and R 4 are in parallel. Furthermore R 1 is in series with the combination of the other resistors. Thus we have: Ω = + + + = 3 / 1 / 1 / 1 1 4 3 2 1 R R R R R eq (b) R 3 and R 4 are in parallel. Furthermore, R 2 is in series with the combination of R 3 , and R 4 . Finally R 1 is in parallel with the combination of the other resistors. Thus we have: Ω = + + + = 5 )] / 1 / 1 /( 1 /[ 1 / 1 1 4 3 2 1 R R R R R eq (c) R 1 and R 2 are in parallel . Furthermore, R 3 , and R 4 are in parallel . Finally, the two parallel combinations are in series. Ω = + + + = 52.1 / 1 / 1 1 / 1 / 1 1 4 3 2 1 R R R R R eq (d) R 1 and R 2 are in series . Furthermore, R 3 is in parallel with the series combination of R 1 and R 2 . Ω = + + = k 1.5 ) /( 1 / 1 1 2 1 3 R R R R eq E2.2 (a) First we combine R 2 , R 3 , and R 4 in parallel. Then R 1 is in series with the parallel combination. Ω = + + = 231 . 9 / 1 / 1 / 1 1 4 3 2 R R R R eq A 04 . 1 231 . 9 10 20 V 20 1 1 = + = + = eq R R i V 600 . 9 1 = = i R v eq eq A 480 . / 2 2 = = R v i eq A 320 . / 3 3 = = R v i eq A 240 . / 4 4 = = R v i eq 2 (b) R 1 , and R 2 are in series . Furthermore, R 3 , and R 4 are in series . Finally, the two series combinations are in parallel. Ω = + = 20 2 1 1 R R R eq Ω = + = 20 4 3 2 R R R eq 10 / 1 / 1 1 2 1 Ω = + = eq eq eq R R R V 20 2 = × = eq eq R v A 1 / 1 1 = = eq eq R v i A 1 / 2 2 = = eq eq R v i (c) R 3 , and R 4 are in series . The combination of R 3 and R 4 is in parallel with R 2 . Finally the combination of R 2, R 3 , and R 4 is in series with R 1 . Ω = + = 40 4 3 1 R R R eq 20 / 1 / 1 1 2 1 2 Ω = + = R R R eq eq A 1 2 1 1 = + = eq s R R v i V 20 2 1 2 = = eq R i v A 5 . / 2 2 2 = = R v i A 5 . / 1 2 3 = = eq R v i E2.3 (a) V 10 4 3 2 1 1 1 = + + + = R R R R R v v s . V 20 4 3 2 1 2 2 = + + + = R R R R R v v s . Similarly, we find V 30 3 = v and V 60 4 = v . 3 (b) First combine R 2 and R 3 in parallel: . 917 . 2 ) 1 / 1 ( 1 3 2 Ω = + = R R R eq Then we have V 05 . 6 4 1 1 1 = + + = R R R R v v eq s . Similarly, we find V 88 . 5 4 1 2 = + + = R R R R v v eq eq s and V 07 . 8 4 = v . E2.4 (a) First combine R 1 and R 2 in series: R eq = R 1 + R 2 = 30 Ω . Then we have A. 2 30 15 30 and A 1 30 15 15 3 3 3 3 1 = + = + = = + = + = eq eq s eq s R R R i i R R R i i (b) The current division principle applies to two resistances in parallel. Therefore, to determine i 1 , first combine R 2 and R 3 in parallel: R eq = 1/(1/ R 2 + 1/ R 3 ) = 5 Ω . Then we have . A 1 5 10 5 1 1 = + = + = eq eq s R R R i i Similarly, i 2 = 1 A and i 3 = 1 A. E2.5 Write KVL for the loop consisting of v 1 , v y , and v 2. The result is  v 1 v y + v 2 = 0 from which we obtain v y = v 2 v 1 . Similarly we obtain v z = v 3 v 1 ....
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This homework help was uploaded on 03/19/2008 for the course EE 331 taught by Professor Preston during the Fall '06 term at University of Texas.
 Fall '06
 Preston

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