INDUCTORS

Chapter 15 INDUCTORS

Lessons In Electric Circuits Volume I – DC Book
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Summary of Contents

Lessons In Electric Circuits Volume I – DC Book

  • Chapter 15INDUCTORSContents 491,15.1 491,Magnetic 491,fields 491,and 491,inductance . . . . . . . . . . . . . . . . . . . . . . . . . . 481 495,15.2 495,Inductors 495,and 495,calculus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 485 501,15.3 501,Factors 501,affecting 501,inductance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 491 507,15.4 507,Series 507,and 507,parallel 507,inductors . . . . . . . . . . . . . . . . . . . . . . . . . . . 497 509,15.5 509,Practical 509,considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 499 509,15.6 509,Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49915.1Magnetic fields and inductanceWhenever electrons flow through a conductor, a magnetic field will develop around that con-ductor. This effect is called electromagnetism. Magnetic fields effect the alignment of electronsin an atom, and can cause physical force to develop between atoms across space just as withelectric fields developing force between electrically charged particles. Like electric fields, mag-netic fields can occupy completely empty space, and affect matter at a distance.Fields have two measures: a field forceand a field flux. The field forceis the amount of”push” that a field exerts over a certain distance. The field fluxis the total quantity, or effect,of the field through space. Field force and flux are roughly analogous to voltage (”push”) andcurrent (flow) through a conductor, respectively, although field flux can exist in totally emptyspace (without the motion of particles such as electrons) whereas current can only take placewhere there are free electrons to move. Field flux can be opposed in space, just as the flowof electrons can be opposed by resistance. The amount of field flux that will develop in spaceis proportional to the amount of field force applied, divided by the amount of opposition toflux. Just as the type of conducting material dictates that conductor’s specific resistance toelectric current, the type of material occupying the space through which a magnetic field forceis impressed dictates the specific opposition to magnetic field flux.481