Magnetic flux: The force of a magnet from the north pole to the south pole.
Magnetic flux density: The amount of flux per unit area perpendicular to the magnetic field.
Weber: SI unit of magnetic flux. (Wb)
Tesla: SI unit of flux density, equal to one weber per square meter.
Gauss: unit from the CGS (centimeter-gram-second) system, unit of flux density.
Hall Effect: The change in current density produces a small trans- verse voltage in the material.
Electromagnet: Produces a magnetic field only when there is current through a conductor.
Reluctance: the opposition to the establishment of a magnetic field in a material.
Permeability: the ease with which a magnetic field can be established in a given material is measured by Permeability of that material.
Solenoid: A type of electromagnetic device that in which the mechanical movement of a shaft or plunger is activated by a magnetizing current.
Relay: An electromagnetically controlled mechanical device in which electrical contacts are opened or closed by a magnetizing current.
Faradays law: A law stating that the voltage induced across a coil equals the number of turns in the coil times the rate of change of the magnetic flux.
Shunt dc motor: Type of motor that has a torque-speed characteristic.
Period of a wave: Time required for a given sine wave to complete one full cycle.
Frequency of a wave: number of cycles that a sine wave completes in one second
B.
1. The primary difference between DC and AC is DC is direct current and AC is alternating current.
2. An AC generator is a rotating electrical machine which generates ac voltage, are based on the principle of electromagnetic induction that produces a voltage when there is relative motion between a magnetic field and a conductor. The primary components are a North and South Pole