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Unformatted text preview: ECE473 EXAM #1 SOLUTIONS FALL 2010 Instructions : 1. Closedbook, closednotes, openmind exam. 2. Work each problem on the exam booklet in the space provided. 3. Write neatly and clearly for partial credit. Cross out any material you do not want graded. Name : Problem 1 : /25 Problem 2 : /25 Problem 3 : /25 Problem 4 : /25 Total : /100 SinglePhase AC Circuits : V = Z I =  V  I  , = v i S = P + jQ = V I =  V  I  = Z  I  2 =  V  2 Z S = P 2 + Q 2 = V I = ZI 2 = V 2 Z P = V I cos = RI 2 = V 2 R Q = V I sin = XI 2 = V 2 X ThreePhase AC Circuits : Z = 3 Z Y S 3 ph = 3 V LN I L = 3 V LL I L P 3 ph = 3 V LN I L cos = 3 V LL I L cos Q 3 ph = 3 V LN I L sin = 3 V LL I L sin V AB = ( 3 30 o ) V AN , V BC = ( 3 30 o ) V BN , V CA = ( 3 30 o ) V CN I aA = ( 3  30 o ) I AB , I bB = ( 3  30 o ) I BC , I cC = ( 3  30 o ) I...
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 Spring '08
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