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Unformatted text preview: ECE 201 Lecture 40 Final Exam Calculator is allowed. No formula sheet is allowedBasic formulas will be provided. Tips for the Final • Review homework problems – TAs do a good job explaining how to solve homework problems in detail. – If you are comfortable in solving all the homework problems, you will be able to solve all the exam problems, in principle . • Exam problems are similar but simpler than homework problems. • “I can do all the homework problems, why didn’t I get 100 points out of 100? In fact, much lower than I thought?” – You have only 120 minutes to solve 24(25) problems ! • Speed is important! Only way to improve your speed is practice ! Some Tips for the Final • SSS does not die out as in transient analysis – Need to identify first whether the problem is SSS or transient analysis (usually obvious). • A question typically has two “twists”. – If you just used Ohm’s law for a resistor, then the results you obtain usually is not correct (except the first several questions in the final). There is another “twist”, either KCL/KVL, or source transformation, etc. needs to be applied. • Understand the solution ≠ full points in exams! – You need to be able to solve a similar question in 4.8 minutes (outside an exam) – This is the ruleofthumb that you “understand” a question and can now proceed to a different question. Some Tips on Complex Numbers 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 1 1 1 1 ( )( ) ( ) 1 Re 1 Im 1 1 1 Im 1 tan tan 1 Re a bj a bj a bj a bj a bj a bj a bj a bj a bj a bj a abj baj b j a b a b a b a a bj a b b a bj a b a bj a b b a bj a bj a bj = = + + + = = + + + + + = + + = + + = + + + = = + + ( 29 2 2 2 2 1 1 tan tan a b a a b b b a a a bj + + = =  =  + ECE 201 Lecture 40 Announcements • Last Lecture #39 – Power factor pf lagging when 0 ° < θ v θ i <180 ° (current lagging voltage) pf leading when 180 ° < θ v θ i <0 ° (current leading voltage) • This Lecture #40: – Maximal power transfer in Sinusoidal Steady State Example PF of the 2terminal network? Current is lagging the voltage by 45 degree: PF of the 2terminal network is “0.707 lagging” eff eff eff Example PF = 0 L?...
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 Fall '08
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 ohm, Thévenin's theorem, maximal average power, Example of Resistive Circuits, Simplifying Linear Circuit Analysis

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