SMU PHYS 1308  Using Inductors (7 pages)
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Using Inductors
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Lecture Notes
 Pages:
 7
 School:
 Southern Methodist University
 Course:
 Phys 1308  General Physics Ii
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General Physics E M PHY 1308 Lecture Notes le home sekula Documents Notebooks PHY1308 General Physics E M PHY 1308 Lecture Notes Lecture 030 Using Inductors SteveSekula 10 November 2010 created 8 November 2010 no tags Goals of this lecture Learn how inductors work in circuits to resist change Describe this behavior mathematically Self Inductance Last time we discussed the idea that a device that stores a magnetic field like a solenoid generates a field and thus establishes a flux through its own area This device is called an inductor Any change in that flux for instance the decrease or increase of current through the solenoid will be resisted This is called self inductance We defined the inductance L using what should be a linear relationship between the current in the inductor and the flux in the inductor L B I What happens if the flux changes in response to a change in current through the inductor The behavior of an inductor Let s imaging an inductor with a steady current passing through it Now change the current suddenly increase or decrease it doesn t matter How does the change in flux relate to the inductance of the device 1 of 7 11 10 2010 01 53 PM General Physics E M PHY 1308 Lecture Notes le home sekula Documents Notebooks PHY1308 If the current changes the flux changes in our inductor d B dI L dt dt We know from Faraday s Law that if the flux changes an EMF will be established that OPPOSES the change E d B dt And inserting Faraday s Law we find the EMF induced in the inductor EL d B dI L dt dt This is the form of Faraday s Law for an inductor with self inductance L Reminder the inductance L has units of T m2 A2 which is given the special name Henrys in honor of the American Joseph Henry who co discovered magnetic inductance Typical inductors in electronic applications have values in the range of micro Henrys up to several Henrys The EMF induced in an inductor when the current changes through the inductor is called back emf and again it s an EMF that is
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