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ECE 201 – Lecture 21

ECE 201 – Lecture 21 - ECE 201 Section 3 Lecture 21 Prof...

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ECE 201, Section 3 Lecture 21 Prof. Peter Bermel October 12, 2012
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Exam #2: Monday, October 15 Runs from 6:30-7:30 pm in EE 129, unless specifically told otherwise Will cover Lectures 12-21: Source transformation Thèvenin and Norton equivalent circuits Maximum power transfer Inductors, parallel & series; LR circuits Capacitors, parallel & series; RC circuits Linear response; waveform generation Undriven LC and RLC resonators 2/29/2012 ECE 201-4, Prof. Bermel
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Exam #2: Monday, October 15 Posted 4 sample exams on Blackboard – also includes equation “sheet” at bottom The one marked “Exam 2 – Review Session” from ‘98 will be reviewed tonight starting at 6:30 pm, here in EE 170 2/29/2012 ECE 201-4, Prof. Bermel
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General Solutions: RC & RL Circuits 2/29/2012 + - C R RC Circuit + - L R RL Circuit g = g G + g ± − g G ² ³(´³´ µ )/¶ Solution steps: Choose g : RC circuits: X=Q or X=V; LR circuits: X=I Find g ± (simplifying diagram) Find g G (simplifying diagram) Find · ´¸ (for inductor/capacitor) Find τ : RC circuits: ¹ = · ´¸ º; LR circuits: ¹ = »/· ´¸ If circuit changes at ¼ ½ , use g(¼ ½ ) from prior solution for initial values
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General Solutions: LC Circuits For an undamped, free (undriven) LC circuit: g G = ± cos²G + ³ sin²G Q(t) is capacitor charge at time t A and B determined by initial conditions ω is the resonant frequency; ² = 1/ ´µ Alternatively, can write: g G = ±′cos ²G + ¶ φ is the phase angle 2/29/2012 L LC Circuit C
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