# ex1f10 - ECE473 EXAM#1 FALL 2010 Instructions 1 Closed-book...

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EXAM #1 FALL 2010 Instructions : 1. Closed-book, closed-notes, open-mind 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 Single-Phase AC Circuits : ˜ V = ¯ Z ˜ I = | ˜ V || ˜ I | ̸ ϕ, ϕ = θ v - θ i ¯ S = P + jQ = ˜ V ˜ I = | ˜ V || ˜ I | ̸ ϕ = ¯ Z | ˜ I | 2 = | ˜ V | 2 ¯ Z S = P 2 + Q 2 = V I = ZI 2 = V 2 Z P = V I cos ϕ = RI 2 = V 2 R Q = V I sin ϕ = XI 2 = V 2 X Three-Phase 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 ϕ = 3 V LL I L cos ϕ Q 3 ph = 3 V LN I L sin ϕ = 3 V LL I L sin ϕ ˜ 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

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ex1f10 - ECE473 EXAM#1 FALL 2010 Instructions 1 Closed-book...

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