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Message: <blockquote data-quote="laal" data-source="post: 8462048" data-attributes="member: 94459">Coils & InductorsAn inductor or a reactor is a passive electrical component  that can store energy in a magnetic field created by the electric  current passing through it. An inductor's ability to store magnetic  energy is measured by its inductance, in units of henries.  Typically an inductor is a conducting wire shaped as a coil, the loops  helping to create a strong magnetic field inside the coil due to Faraday's Law of Induction.  Inductors are one of the basic electronic components used in  electronics where current and voltage change with time, due to the  ability of inductors to delay and reshape alternating currents.<img src="http://lh5.ggpht.com/_8JZhVVmpICU/S8AZjYQjOaI/AAAAAAAAAJk/M3yaewJfdB8/smt%20coils.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /><a href="http://en.wikipedia.org/wiki/Inductance" target="_blank">Inductance</a>  (L) (measured in <a href="http://en.wikipedia.org/wiki/Henry_%28unit%29" target="_blank">henries</a>) is an effect resulting from the <a href="http://en.wikipedia.org/wiki/Magnetic_field" target="_blank">magnetic field</a> that forms around a current-carrying <a href="http://en.wikipedia.org/wiki/Electrical_conductor" target="_blank">conductor</a> which tends to resist changes  in the current. <a href="http://en.wikipedia.org/wiki/Electric_current" target="_blank">Electric current</a> through the conductor  creates a <a href="http://en.wikipedia.org/wiki/Magnetic_flux" target="_blank">magnetic flux</a> proportional to the current, and  a change in this current creates a corresponding change in magnetic  flux which, in turn, by <a href="http://en.wikipedia.org/wiki/Faraday%27s_law_of_induction" target="_blank">Faraday's Law</a> generates an <a href="http://en.wikipedia.org/wiki/Electromotive_force" target="_blank">electromotive force</a>  (EMF) that opposes  this change in current. Inductance is a measure of  the amount of EMF  generated per unit change in current. For example, an  inductor with an  inductance of 1 henry produces an EMF of 1 volt when  the current through  the inductor changes at the rate of 1 ampere per  second. The number of  loops, the size of each loop, and the material it  is wrapped around all  affect the inductance. For example, the magnetic  flux linking these  turns can be increased by coiling the conductor  around a material with a  high <a href="http://en.wikipedia.org/wiki/Permeability_%28electromagnetism%29" target="_blank">permeability</a> such as iron.  This can increase the inductance by 2000 times, although less so at high  frequencies.<img src="http://lh3.ggpht.com/_8JZhVVmpICU/S8AobeWB5xI/AAAAAAAAAKU/C7_AtFtHqr0/Smt%20Transformer.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />Inductors are used extensively in <a href="http://en.wikipedia.org/wiki/Analog_circuit" target="_blank">analog circuits</a> and signal processing.  Inductors in conjunction with <a href="http://en.wikipedia.org/wiki/Capacitor" target="_blank">capacitors</a>  and other components form tuned circuits which can emphasize or <a href="http://en.wikipedia.org/wiki/Electronic_filter" target="_blank">filter</a> out specific signal frequencies. Applications range   from the use of large inductors in power supplies, which in conjunction   with filter <a href="http://en.wikipedia.org/wiki/Capacitor" target="_blank">capacitors</a> remove residual hums known as the <a href="http://en.wikipedia.org/wiki/Mains_hum" target="_blank">Mains  hum</a> or other fluctuations from the direct current output, to the  small inductance of the <a href="http://en.wikipedia.org/wiki/Ferrite_bead" target="_blank">ferrite  bead</a> or <a href="http://en.wikipedia.org/wiki/Torus" target="_blank">torus</a>  installed around a cable to prevent <a href="http://en.wikipedia.org/wiki/Radio_frequency_interference" target="_blank">radio frequency  interference</a> from being transmitted down the wire. Smaller  inductor/capacitor combinations provide <a href="http://en.wikipedia.org/wiki/Tuned_circuit" target="_blank">tuned circuits</a> used in radio reception and  broadcasting, for instance.</blockquote>

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