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ECE201_39_Jung

# ECE201_39_Jung - ECE 201 Lecture 39 Power Factor and Power...

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ECE 201 Lecture 39 Power Factor and Power Factor Improvement Announcements Last Lecture #38: average power Complex power reactive power For an element of impedance Complex power conserves, apparent power does NOT. This Lecture #39: Power factor and power factor improvement cos( ) sin( ) eff eff v i eff eff v i V I jV I θ θ θ θ = = - + - * eff eff S V I

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Final Exam / Evaluation
Tips on Preparing for 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 16-18 problems! Speed is important! Only way to improve your speed is practice !

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Strategies for Final Read the problems (and circuits) carefully. If you can’t solve it at the first sight, redraw the circuit diagram. Do not spend two much time on one single problem. You may be able to solve it more quickly after you warm up. We test your knowledge of circuit analysis. Try to tell what each question is for, e.g. does it test for the Ohm’s law, definition of power, voltage division, current division, etc.? If you can do so, then you will likely get it right. We do not require more than two “brain twists” to solve the problem.
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