253-1-sinusoids-and-phasors-4

253-1-sinusoids-and-phasors-4 - such that the net impedance...

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EECE 253: Sinusoids and Phasors Slide 1.4.1 • When analysing AC circuits, generally easier to analyze in the frequency domain than time domain. • In the frequency domain, voltages and currents are represented by phasors while components are represented by impedances (or admittances). • Ohm’s and Kirchhoff’s laws apply to AC circuits in the same way as DC circuits: • Impedances in series (or parallel) combine the same way as resistances in series (or parallel). “Take Home Message” (KVL) 0 and (KCL), 0 , k k = = = V I ZI V 1 n 1 2 1 1 1 p n 2 1 s Z Z Z Z Z Z Z Z + + + = + + + = L L and
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EECE 253: Sinusoids and Phasors Slide 1.4.2 Example: Impedances Given Determine the equivalent impedance Z eq : + = ) 6 . 0 80 . 3 ( : Ans j Z eq
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EECE 253: Sinusoids and Phasors Slide 1.4.3 Example: Impedance If it is desired to connect a capacitor in series with the parallel combination
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Unformatted text preview: such that the net impedance is resistive at 10 MHz, what is the required value of C ? Ans: C =235pF EECE 253: Sinusoids and Phasors Slide 1.4.4 Example: Phase-Shifters Example: If 1 V is applied, find magnitude and phase shift produced at 5kHz. Specify whether phase shift is leading or lagging. Ans: 0.172, 120.4 ˚ , lagging lags , : C For leads , : L For I V I V I V I V C j L j ω = = EECE 253: Sinusoids and Phasors Slide 1.4.5 Example: Maxwell Bridge Find L x and R x if the bridge is balanced when R 1 =40k Ω , R 2 =1.6k Ω , R 3 =4k Ω and C s =0.45 µ F Ans: R x =160 Ω , L x =2.88H...
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This note was uploaded on 07/20/2009 for the course PHYS physics 10 taught by Professor Goatman during the Spring '08 term at UBC.

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253-1-sinusoids-and-phasors-4 - such that the net impedance...

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