Chap 7 Inductors&amp;Capacitors

# Chap 7 Inductors&amp;amp;Capacitors - An Inductor is an...

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An Inductor is an energy storage lement . It is a two-terminal circuit element that is a model of a real device that consists of a coil of resistance-less wire wound around a material. i + v - L Inductance L is the inductanc e of the device. L = ( μ o N 2 A) /(l + 0.45d) (if l >d/2 & core is non-ferromagnetic) where N is the number of turns of the wire A is the cross sectional area of the loops l is the length of the coil d is the diameter of the wire μ o = the permeability of free space = 4 π x 10-7 H/m. In this case the material inside the coil is a vacuum. Inductance is a property of the device that measures the ability of the device to store energy in the form of a magnetic field. The units of inductance are Volt-Seconds per Ampere or Henrys. The voltage-current characteristic for an inductor is: v = L di/dt -or- i = 1/ L to t v dt + i(t o ) Two observations from the v-i characteristic: There is no voltage across an inductor if the current through it is not changing with time. That is why we say that “inductors act as a short circuit to a dc current”.

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## This note was uploaded on 11/17/2011 for the course ECT 298 taught by Professor Hardiman during the Fall '11 term at N.C. A&T.

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Chap 7 Inductors&amp;amp;Capacitors - An Inductor is an...

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