lec32

# lec32 - Test#3 Nov 12 2009 Thursday 6:30 7:30 PM MTHW 210...

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1 1 Test #3 Nov. 12, 2009, Thursday, 6:30 - 7:30 PM, MTHW 210 No calculator, no formula sheet, no cell phone. Tables 13.1 and 13.2 will be handed out with the test. Material covered: Chap. 17 and 21 and notes HW#8, #9 and #10 Lectures #22 to #32, inclusive No convolution and no mutual inductance at Test #3 A seating chart will be posted in 202 Help Room and on my office door (MSEE 262) by 11/12/09 noon. You have to sit in the assigned seat only. MC and WO questions. Turn in the scantron sheet and the test packet. Bring PU ID Class as usual, 11/9, 11/11 and 11/13 (M, W and F) HW #10 is due on 11/11/09 No class, 11/23/09, Monday Summary of Lecture #32 11/09/09 Magnetically coupled circuits Isolated coils and coupled coils Mutual inductance M 12 , M 21 and M Dot convention Time domain VI characteristic s-domain VI characteristic Examples M 12 = M 21 = M and M 2 L 1 L 2 from the energy consideration (pp.766-769) Coupling coefficient k Resistors Inductors Capacitors Time domain representation Freq. domain representation V =j ϖ L I V = R I v = Ri di v L dt = dv i C dt = 1 V I j C = ϖ s-domain representation V = RI V = sL I 1 V I sC = 4 Isolated inductors, coupled coils and transformers Isolated coils or windings A few turns to a few thousand turns Air core, iron core or ferrite core Single winding or multiple windings For “ideal inductors”, we ignore the wire resistance. For real inductors, refer to Section 17.9 Coupled coils Air core coils Iron core coils What do transformers do? Vary voltage and current while keep power the same. Form parts of circuits for signal filtering and impedance matching.

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2 VI chara. of an isolated inductor with i(0 - ) = 0 VI characteristic of coupled coils in time domain, with i 1 (t) and i 2 (t) going into dotted terminals VI characteristic of coupled coils in s domain, assuming
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lec32 - Test#3 Nov 12 2009 Thursday 6:30 7:30 PM MTHW 210...

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