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Magnetism Summary
Figure 26    Magnetic Current with Closed Iron Path

Electrical Science Volume 1 of 4
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Basic Electrical Theory MAGNETIC CIRCUITS MAGNETIC CIRCUITS What  is  a  magnetic  circuit?    To  better  understand  magnetic  circuits,  a  basic understanding of the physical qualities of magnetic circuits will be necessary. EO 1.8 EXPLAIN  the  physical qualities  of  a  simple magnetic  circuit, including relationships of qualities and units of measurements. EO 1.9 Given   the   physical   qualities   of   a   simple   magnetic   circuit, CALCULATE the unknown values. EO 1.10 DESCRIBE the shape and components of a BH magnetization curve. EO 1.11 EXPLAIN the cause of hysteresis losses. EO 1.12 Given Faraday’s Law of induced voltage: a. DESCRIBE how varying parameters affect induced voltage. b. CALCULATE voltage induced in a conductor moving through a magnetic field. EO 1.13 STATE Lenz’s Law of induction. Magnetic Circuits A magnetic circuit can be compared with an electric current in which EMF, or voltage, produces a current flow.   The ampere-turns (NI), or the magnetomotive force (Fm or mmf), will produce a magnetic flux F (Figure 26).   The mmf can be compared with EMF, and the flux (F) can be compared to current.  Equation (1-16) is the mathematical representation of magnetomotive force derived using Ohm’s Law, . I E R F = (1-16) Fm R mmf R where F = magnetic flux, Wb Fm = magnetomotive force (mmf), At R = reluctance, At Wb Rev. 0 Page 37 ES-01







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