Terminology Flashcards
Why is an alternating current waveform called a sine wave?
A waveform represents the current or voltage varying with the sine of the elapsed time
Metals that are easily magnetized
Ferromagnetic
Ie) Iron - this is a ferrous material
Metals that cannot be magnetized
Diamagnetic
Ie) copper, brass
Magnetic lines of force
Flux
The magnetic field formed around a conductor
Electromagnetic field
The base material of a coil
Core material, iron
The ability of a material to become magnetized
Permeability.
Resistance to magnetism
Reluctance.
Ie) Iron = low reluctance, becomes easily magnetized
Copper = high reluctance, does not become magnetized
Measure of a materials ability to retain magnets
Retentivity or Coercive Force
Term used to describe the total force producing a magnetic field
Magnetomotive Force (mmf)
Measure of charge
Coulomb
Ohms law for DC current
Current is directly proportional to the voltage, inversely proportional to the resistance.
What is a node?
A junction in a circuit
Electromagnetic Induction
When a conductor cuts through magnetic lines of flux a voltage is induced into the inductor
Lenz Law
An induced voltage or current opposes the motion that causes it.
