Exam 4 Magnetics and such Flashcards
(23 cards)
Magnetic Pole
The physical quantity that exerts magneto-static forces on one another.
Magnetic Dipole
Molecular arrangement of separation between north and south poles in an object. Always has net zero magnetic pole.
Magnetic Pole SI Unit
Ampere meter = Am
Force between 2 poles
Permeability of Free Space
4π
Magnetic Polarization
Individual molecules reorient themselves such that their north magnetic poles face one direction and the south another.
Ferromagnetic
Individual atoms/ molecules are actively and unavoidably magnetic. Subject to magnetic polarization.
Megnetic Domain
A small microscopic section of a material with a net magnetic pole. In steel these domains are cancelled by adjacent domains such that the steel overall has no magnetic property.
Magnetization
The reorientation of magnetic domains to create net magnetic effect.
Soft/ hard magnetic material
Material that easily/not easily demagnetizes when all adjacent poles are removed.
Magnetostatic Force
Magnetic Field SI Unit
Tesla
Tesla
N*A*m = T
Electromagnet
Any object that becomes magnetized when an electric current is introduced
Power wasted as thermal energy
Power consumed = voltage drop * current = current^2 * resistance
Superconductor
Material with no electrical resistance
Root Mean Square Voltage
Nominal AC voltage
Transformer
Uses the connections between electricity and magnetism to convey power from one AC current to another.
Magnetic Induction
Change in magnetic field causes electric field
Lenz’s Law
When a changing magnetic field induces a current in a conductor, the magnetic field from that current opposes the change that is induced in it.
Inductor
A coil that has a natural opposition to current change.
Secondary Voltage
Primary voltage * secondary turns/primary turns
Secondary Current
primary current * primary turns/secondary turns
