ch02 FE sol's

# ch02 FE sol's - Solutions to FE Problems Chapter 2 2FE-1...

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Solutions to FE Problems Chapter 2 2FE-1 What is the power generated by the source in the network in Fig. 2PFE-1? The correct answer is b . V 120 S R 1 R 2 R 3 R 4 R 5 R a b c Resistors R 1 , R 2 , and R 3 are connected in delta. A delta-wye transformation can be conducted. = + + = + + = k k k k k k R R R R R R a 3 12 18 6 ) 18 ( 6 3 2 1 2 1 = + + = + + = k k k k k k R R R R R R b 6 12 18 6 ) 12 ( 18 3 2 1 3 2 = + + = + + = k k k k k k R R R R R R c 2 12 18 6 ) 12 ( 6 3 2 1 3 1

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V 120 S R c R b R 4 R 5 R a b c a R )] 6 6 ( ) 4 2 [( 3 5 )] ( ) [( 5 4 k k k k k k R R R R R R R b c a s eq + + + + = + + + + = = + + = k k k k k k R eq 12 12 6 ) 12 ( 6 8 W k R V P eq s V s 2 . 1 12 ) 120 ( 2 2 = = = 2FE-2 Find V ab in the circuit in Fig. 2PFE-2. The correct answer is d . A 4 15 10 10 5 a b 2 I 1 I
( 29 A I 5 . 1 4 15 10 5 10 5 10 1 = + + + + = ( 29 A I 5 . 2 4 15 10 5 10 15 10 2 = + + + + = V V 5 . 12 ) 5 . 2 ( 5 5

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ch02 FE sol's - Solutions to FE Problems Chapter 2 2FE-1...

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