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43 Cards in this Set

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  • Back
Primary Functions of an x-ray imaging system
to convert electric energy into electro-magnetic energy
Matter
has mass and energy equivalence. May also have electric charge
Electrostatics
the study of stationary electric charges
Electrified
an object is electrified if it has too few or too many electrons
Electrification
can be created by contact friction, or induction
Electrification
is due to the movement of negative electric charges
Electrostatic Charge
smallest unit of electric charge is the electron
mAs
is a measure of electrostatic charge
Electrostatic force
the force of attraction between unlike charges or repulsion between like charges is due to the electric field
Coulomb's law
the electrostatic force is directly proportional to the product of the electrostatic charges and inversely proportional to the square of the distance between them
Electric charge
distribution is uniform throughout or on the surface
Volt
the unit if electric potentional ; also called voltage... the higher the voltage the higher the potential to do work
Electrodynamics
the study of electric charges in motion
Four electrical states of matter
Superconductor, conductor, semiconductor, insulator
Superconductor
Material - Niobium, Titanium
Characterisitcs: no resistance to electron flow, no electric potential required, must be very cold
Conductor
Copper, Aluminum Characterisitics: variable resistance, obeys Ohm's law, requires voltage
Semiconductor
Silicon, Germanium Characterisitics: Can be conductive, Can resistive, Basis for computer technology
Insulator
Rubber, Glass Characterisitics: Does not permit electron flow, Extremely high resistance, Necessary with high voltage
conductor
any substance through which electrons flow easily
Insulator
any material that does not allow electron flow
Semiconductor
a material that under some conditions behaves as an insulator in other conditions behaves as a conductor
Amperes (A)
Measurement of electric current. Ampere is proportional to the number of electrons flowing in the electric circuit
Voltage (V)
Measurement of electric potential
Ohms
Measurement of electrical resistance
Ohm's Law
the voltage across the total circuit of any portion of the circuit is equal to the current times the resistance
Direct Current (DC)
Electrons flowing in one direction
Alternating current (AC)
Electrons flowing alternately in opposite directions
Watts (W)
Measurement for electrical power .. x-ray imaging system 20 - 150 kW of electric power
Watt
One watt is equal to 1 A of current flowing through an electric potential of 1 V
Magnetic Field
Any charged particle in motion creates a magnetic field
Magnetic Field
The lines of magnetic field are always closed loops
Magnetic Permeability
the ability of a material to attract the lines of magnetic field intensity
Magnets
classified accofing to the origin of magnetic property
Electro magnets
wire wrapped around an iron core
Nonmagnetic
Wood, Glass
Unaffected by a magnetic field
Diamagnetic
Water
Weakly repelled from both poles of a magnetic field
Parmagnetic
Gadolinium
Weakly attracted to both poles of a magnetic field
Ferromagnetic
Iron, nickel, colbalt
Can be strongly magnetized
Magnetic Susceptibility
the degree to which a material can be magnetized
Ferromagnetic
can be made into magnets by induction
Magnetic Force
is proportional to the product of the magnetic pole strengths divided by the square of the distance between then
Telsa
SI unit of magnetic field strength (Older unit = gauss)
1 Telsa (T) =
10,000 gauss (G)