Electronics

Subdecks (1)

Cards (147)

  • Joule (J)

    Unit of work done in moving one Coulomb (C) of charge
  • Electric Current
    Any directional movement of electric charges such as electrons
  • Ampere
    Current of one ampere is equal to one Coulomb (1C) of charge flowing through a given point in one second (1s)
  • Magnetism
    The property of a device or material to attract bodies of iron and other magnetic material or magnets
  • Sources of Steady Magnetic (Magnetostatic) Field
    • Permanent Magnet
    • Electric Field changing linearly with time
    • Direct Current
  • Dipoles and Magnetic Moments
    • The magnetic behavior of materials can be traced to the structure of atoms
    • Bohr Magneton - The strength of a magnetic moment of an electron (μB) due to electron spin
  • The spin of the electron produces a magnetic field with a direction dependent on the quantum number ms
  • Electrons orbiting around the nucleus create a magnetic field around the atom
  • Theories of Magnetism
    • Weber Theory - Weber's theory assumes that all magnetic substance are composed of tiny molecular magnets
    • Domain Theory - A theory based on the electron spin theory
  • Magnetic Field
    The space surrounding a magnet where magnetic forces act
  • Lines of Force
    Lines that are used to represent the force existing in the area surrounding a magnet
  • Magnetic Flux (φ)
    The total number of magnetic lines of force leaving or entering the pole of a magnet
  • Units of Magnetic Flux (φ)
    • Maxwell - The cgs unit of magnetic flux
    • Weber - The SI unit of magnetic flux
  • Magnetic Flux Density (B)
    The number of magnetic field lines per unit area of a section perpendicular to the direction of flux
  • Units of Flux Density (B)
    • Gauss - A cgs unit of Magnetic Flux Density
    • Tesla - The SI, the unit of Magnetic Flux Density
  • Permeability
    Its ability to accept, allow or setup a magnetic field is described by a numerical value called Permeability of the material
  • Magnetization Curve or B-H Curve

    The B-H Curve depicts the ability of a material to accept, allow or set-up a magnetic field as it is subjected to a magnetizing force
  • Magnetic Hysteresis
    The delayed reaction of the magnetization of a ferromagnetic material, with the change of the magnetizing force
  • Hysteresis Loop

    shows the relationship between the induced magnetic flux density (B) and the magnetizing force (H)
  • Types of Magnets
    • Natural Magnets
    • Artificial Magnets - Permanent Artificial Magnet, Temporary Artificial Magnet
  • Types of Magnets
    • Natural Magnets
    • Artificial Magnets
    • Permanent Artificial Magnet
    • Temporary Artificial Magnet
  • Classification of Magnets
    • Ferromagnetic Materials
    • Paramagnetic Materials
    • Diamagnetic Materials
  • Curie Temperature
    The temperature above which ferromagnetic or ferrimagnetic materials become paramagnetic
  • Ferromagnetic behavior disappears above the Curie temperature
  • Electromagnets
    Magnets where the magnetic field intensity is directly proportional to the current flowing through a coil with a number of turns
  • Magnetic Circuits
    A closed path to which a magnetic field, represented as lines of magnetic flux, is confined
  • Magnetomotive Force (MMF)
    The magnetic force that tends to set up magnetic flux, produced due to the applied electric current in the coil of N turns
  • Units of Magnetomotive Force (MMF)
    • Ampere Turns
    • Gilberts
  • Magnetic Field Intensity (H)
    The magnetomotive force per unit length at any given point in a magnetic circuit
  • Magnetic Field Intensity (H) is also given by the Biot-Savart Law
  • Units of Magnetic Field Intensity
    • Ampere-Turns per Meter
    • Oersted
  • Summary of Magnetic Units
  • Faraday's Law
    The magnitude of the emf induced in a circuit is proportional to the rate of change of the magnetic flux that cuts across it
  • Faraday's First Law
    Electromotive Force (EMF) is induced whenever a conductor cuts magnetic flux
  • Faraday's Second Law
    The magnitude of the induced emf is proportional to the relative rate of change of flux
  • Maxwell's Equations
    • Gauss Law for electrostatics
    • Gauss Law for magnetism
    • Faraday's Law
    • Ampere's Law (with Maxwell's Correction)
  • Magnetic flux
    The total number of magnetic lines of force of a magnetic field
  • Resistors
    Components limiting electric current or providing voltage drop.
  • Fixed Resistors
    Types include Carbon Composition and Metal Film.
  • Variable Resistors

    Include Potentiometers and Rheostats.