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Encyclopedia > Magnetomotive force

In physics, the magnetomotive force produces magnetic flux. It is measured in units of ampere-turns.


In this context, the word "force" is used in a general sense of "that which has a physical effect", and is not the same as mechanical force measured in newtons.

SI electromagnetism units

edit  (http://en.wikipedia.org/w/index.php?title=Template:SI_electromagnetism_units&action=edit)
Name Symbol Dimensions Quantity
ampere (SI base unit) A A Current
coulomb C A新 Electric charge, Quantity of electricity
volt V J/C = kg搶2新−3嫂−1 Potential difference
ohm Ω V/A = kg搶2新−3嫂−2 Resistance, Impedance, Reactance
ohm metre Ω搶 kg搶3新−3嫂−2 Resistivity
farad F C/V = kg−1搶−2嫂2新4 Capacitance
farad per metre F/m kg−1搶−3嫂2新4 Permittivity
reciprocal farad F−1 kg1搶2嫂−2新−4 Elastance
siemens S Ω−1 = kg−1搶−2新3嫂2 Conductance, Admittance, Susceptance
siemens per metre S/m kg−1搶−3新3嫂2 Conductivity
weber Wb V新 = kg搶2新−2嫂−1 Magnetic flux
tesla T Wb/m2 = kg新−2嫂−1 Magnetic flux density
ampere per metre A/m m−1嫂 magnetic induction
ampere-turns per weber A/Wb kg−1搶−2新2嫂2 Reluctance
henry H V新/A = kg搶2新−2嫂−2 Inductance
henry per metre H/m kg搶新−2嫂−2 Permeability
(dimensionless) - - Magnetic susceptibility

See also


  Results from FactBites:
 
U.S. Patent: 6129073 - Electromagnetic fuel injector and control method thereof - October 10, 2000 (11418 words)
Magnetomotive force is expressed by the value U (=NI) obtained by multiplying the number of coil turns N (T) by the current I (A) flowing in a coil, and it can be used to evaluate the electromagnetic attraction force which can be attained for the short time At.
Further, during valve closing operations, the magnetomotive force generated during the valve open hold period decays in response to interruption of the voltage to the hold coil 12, that is, the electromagnetic force decays.
A magnetic attraction force attracting the plunger 15 is generated by the magnetic flux passing through a magnetic path in a magnetic circuit composed of the core 23, the yoke 24, and the plunger 15.
Magnetics (4094 words)
The symbol for magnetomotive force is "F" and it is measured in Gilberts.
The magnitude of the force depends on the speed of the electron, the flux density, and the angle of motion relative to the orientation of the field.
The magnitude of the force is greatest when the vectors are at ninety degrees to one another and diminishes as the angle between the two vectors closes.
  More results at FactBites »

 

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