TABLE OF CONTENTS The following definitions of terms relating to magnetic materials and to the properties and testing of these materials have been selected from ASTM Standard. [ ] Terms primarily related to magnetostatics are indicated by the symbol * and those related to magnetodynamics are indicated by the symbol **. General (nonrestricted) terms are not marked.
**AC Excitation N 1 I/l 1 . The ratio of the rms ampere-turns of exciting current in the primary winding of an inductor to the effective length of the magnetic path.
**Active (Real) Power P. The product of the rms current I in an electric circuit, the rms voltage E across the circuit, and the cosine of the angular phase difference ? between the current and the voltage.
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NOTE: The portion of the active power that is expended in a magnetic core is the total core loss P c .
Aging, Magnetic. The change in the magnetic properties of a material resulting from metallurgical change. This term applies whether the change results from a continued normal or a specified accelerated aging condition.
NOTE: This term implies a deterioration of the magnetic properties of magnetic materials for electronic and electrical applications, unless otherwise specified.
Ampere-turn. Unit of magnetomotive force in the rationalized mksa system. One ampere-turn equals 4 ?/10, or 1.257 gilberts.
Ampere-turn per Meter. Unit of magnetizing force (magnetic field strength) in the rationalized mksa system. One ampere-turn per meter...
