253-1-sinusoids-and-phasors-3

# 253-1-sinusoids-and-phasors-3 - Impedance You know how to...

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EECE 253: Sinusoids and Phasors Slide 1.3.1 Impedance • You know how to compute equivalent resistance for resistive networks, equivalent capacitance for capacitive networks and equivalent inductance for inductive networks. • We wish to, more generally, take a linear network of passive components, no matter how complicated, and compute an equivalent impedance , a measure of the opposition exhibited by the network to the flow of sinusoidal current.

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EECE 253: Sinusoids and Phasors Slide 1.3.2 Impedance and Admittance The impedance (denoted Z , measured in ) of a 2-terminal network is the ratio of phasor voltage to phasor current: I V Z = The admittance (denoted Y , measured in S) of a 2-terminal network is the ratio of phasor current to phasor voltage: Ohm’s law in phasor domain (Ohms) (Siemens) V=ZI V I Z Y = = 1
EECE 253: Sinusoids and Phasors Slide 1.3.3 Impedance and Admittance R 1 = Y L j ω 1 = Y C j = Y C L R Admittance Impedance Element Impedances and admittances of passive elements R = Z L j = Z C j 1 = Z

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253-1-sinusoids-and-phasors-3 - Impedance You know how to...

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