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This online resource provides comprehensive information on various concepts related to electromagnetic induction and electromagnetism. Topics include coils, electromagnetism, left-hand rule, magnet terms, magnetizing force, reluctance, permeability, flux density, magnetizing force, permeabilities of various materials, flux density vs. Magnetizing force, remanence or retentivity, applications of electromagnetism, and electromagnetic induction. Concepts such as maxwell, magnet flux, weber, flux density, magnetomotive force, magnetizing force, reluctance, electric resistance, permeability, magnetic permeability, electric conductance, permeabilities of various materials, b-h curve, saturation point, hysteresis, remanence, coercive force, magnetic type circuit breaker, electric bell, relay, solenoid, lenz's law, and faraday's law.
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Online Resource for ETCH 213Faculty: B. Allen Electromagnetism Relates to the magnetic field generated around a conductorwhen current is passing through it.
Left-hand rule Online Resource for ETCH 213Faculty: B. Allen
If the fingers of the left hand are placed around the wire sothat the thumb points in the direction of the electronic currentflow, the fingerswill be pointingin the directionof the magneticfield beingproduced by theconductor.
Magnet Terms Online Resource for ETCH 213Faculty: B. Allen Maxwell – One magnetic line of force or flux iscalled a Maxwell.Magnet Flux (
φ) – The magnetic lines of force produced by a magnet.Weber – 10
8 Maxwells. Flux Density (
β) – A measure of the strength of a wave.Flux Density (
β) = Magnet Flux(
φ)/Area (A)
Online Resource for ETCH 213Faculty: B. Allen
Reluctance ( Online Resource for ETCH 213Faculty: B. Allen
R)
Reluctance – Resistance to the flow of magnetic linesof force.
Magnetic Reluctance (
R) = mmf/
φ
Measured in Ampere-Turns/Weber
Electric Resistance (R) =V/IMeasured in Ohms
Online Resource for ETCH 213Faculty: B. Allen Permeabilities of various
materials
Online Resource for ETCH 213Faculty: B. Allen
Remanence or Retentivity – The amount of amaterial that remains magnetized after themagnetizing force has been removed.Coercive Force – Magnetizing force needed toreduce the residual magnetism within a material tozero.
Applications of Online Resource for ETCH 213Faculty: B. Allen electromagnetism Magnetic type circuit breaker
Solenoid Online Resource for ETCH 213Faculty: B. Allen
Solenoid – A coil and movable iron core that, when energizedby an alternating or direct current, will pull the core into acentral position.
Online Resource for ETCH 213Faculty: B. Allen
Electromagnetic induction Electromagnetic Induction – The voltage produced ina coil due to relative motion between the coil andmagnetic lines of force.Faraday’s Law – When a magnetic field cuts aconductor, or when a conductor cuts a magnetic field,an electric current will flow in the conductor if aclosed path is provided over which the current cancirculate.
Generator Online Resource for ETCH 213Faculty: B. Allen
Generator – A device used to convert a mechanicalenergyinput intoan electricalenergyoutput.
Online Resource for ETCH 213Faculty: B. Allen Parts of a generator Armature – The rotating or moving components of amagnetic circuitStator – The stationary components of a magneticcircuit