Lecture_12 - Inductors Inductor Consists of a coil of...

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1 BME 311 Network Theory John X.J. Zhang, UT Austin 1 Inductors • Inductor – Consists of a coil of conducting wire ( bulky, expensive ) • Inductance L – Property of opposition to the change of current (Unit: Henry, H) dt di L v = l A N L μ 2 = BME 311 Network Theory John X.J. Zhang, UT Austin 2 • Typical inductor value: H (10 -6 ) to H • Fixed and variable inductors – Core: iron, steel, plastic or air •Symbo
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2 BME 311 Network Theory John X.J. Zhang, UT Austin 3 Linear Inductor dt t v L i t = ) ( 1 = i ) ( ) ( 1 0 0 t i dt t v L i t t + = dt di L v = or Power i dt di L vi p ) ( = = 2 2 1 ) ( Li dt i dt di L pdt w t t = = = Energy BME 311 Network Theory John X.J. Zhang, UT Austin 4 • Is an inductor an open circuit or a short circuit to dc ? • The current through an inductor cannot change abruptly – Discontinuous change in i Æ infinite v dt di L v =
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3 BME 311 Network Theory John X.J. Zhang, UT Austin 5 Inductor Model • Ideal inductor does not dissipate energy
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Lecture_12 - Inductors Inductor Consists of a coil of...

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