##### Created by:

awkocher  on October 17, 2011

##### Description:

electricity, magnetism, and electromagnetism

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 primary function of an x-ray imaging system is to convert _______ energy into _______ energyelectric; electromagnetic
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#### Definitions

primary function of an x-ray imaging system is to convert _______ energy into _______ energy electric; electromagnetic
unlike charges _______; like charges _______ attract; repel
a conversion takes place in the x-ray tube where most electric energy is transformed into _______, some of it into _______ heat; x-rays
matter has mass and _______ equivalence; matter also may have _______ charge energy; electric
_______ is the study of stationary electric charges electrostatics
coulomb's law electrostatic force (F) is directly proportional to the product of the electrostatic charges (Qa & Qb) and inversely proportional to the square of the distance between them
fundamental unit of electric charge coulomb (C)
the force of attraction between unlike charges or repulsion between like charges is due to the _______ field; it is called an _______ force electric; electrostatic
electric charge of a conductor is concentrated along the _______ of the surface sharpest curvature
electrons often are _______ from the outermost shell of one atom to another free to travel
protons are _______ inside the nucleus fixed
the higher the voltage, the greater is the _______ to do work potential
an object is said to be _______ if it has too few or too many electrons electrified
coulomb's law equation F = k QaQb divided by d(squared)
any substance through which electrons flow easily conductor
x-ray imaging systems usually requires _______ V or higher 220
unit of electric potential volt (V)
electric resistance is measured in _______ ohms (upside down horseshoe)
electric potential is measured in _______ volts (V)
ohm's law the voltage across the total circuit or any portion of the circuit is equal to the current times the resistance
in a _______ circuit, all circuit elements are connected in a line along the same conductor series
any material that does not allow electron flow insulator
a material that under some conditions behaves as an insulator and in other conditions behaves as a conductor semiconductor
the property of some materials to exhibit no resistance below a critical temperature superconductivity
a _______ circuit contains elements that are connected at their ends rather than lying in a line along a conductor parallel
the study of electric charges in motion electrodynamics
electric charge distribution is _______ throughout or on the surface uniform
waveform of AC is a _______ curve sine
electric power is measured in _______ watts (W)
increasing electric resistance results in a _______ electric current reduced
ohm's law formula V = IR .... volts = amperes times ohms .... electric potential = electric current times electric resistance
if electrons flow in one direction along the conductor, the electric current is called _______ current direct (DC)
current drawn out in a graph waveform
rules for parallel circuits: the sum of the currents through each circuit element is ... equal to the total circuit current
DC is represented by a _______ line horizontal
rules for series circuits: the current through each circuit element is the same and is ... equal to the total circuit current
current where electrons oscillate back and forth is called _______ current alternating (AC)
rules for parallel circuits: the total resistance is the inverse of the sum of ... the reciprocals of each individual resistance
rules for series circuits: the total resistance is equal to ... the sum of the individual resistances
magnets are classified according to the _______ of the magnetic property origin
rules for parallel circuits: the voltage across each circuit element is the same and is ... equal to the total circuit voltage
unit for current amperes (A)
rules for series circuits: the sum of the voltages across each circuit element is ... equal to the total circuit voltage
any charged particle in motion creates a _______ field magnetic
the lines of a magnetic field are always _______ loops closed
the magentic force is proportional to the _______ of the magnetic pole strengths _______ by the square of the distance between them product; divided
materials that are unaffected when brought into a magnetic field nonmagnetic (wood, glass)
all _______ can be classified according to the manner in which it interacts wtih an external magnetic field matter
electric power formula P=IV (power in watts = current in amperes times electric potential in volts)
materials that are weakly repelled by either magnetic pole diamagnetic (water, plastic)
materials that lie somewhere between ferromagnetic and nonmagnetic; slightly attracted to a magnet and loosely influenced by an external magnetic field paramagnetic (gadolinium, contrast agents in MRI)
ferromagnetic objects can be made into magnets by _______ induction
materials that are strongly attracted by a magnet and usually can be permanently magnetized ferromagnetic (iron, cobalt, nickle)
if the distance between two bar magnets is halved, the magnetic force increases by _______ times four
the SI unit of magnetic field strength tesla (T)
any charge in motion induces a _______ field magnetic
using zinc and copper plates, he came up with the first battery Volta (the voltaic pile)
faraday's law: the magnitude of the induced current depends on: the _______ of the magnetic field strength
any device that converts some form of energy directly into electric energy is said to be a source of _______ force electromotive
a coild of wire is called a _______ solenoid
electric potential is measured in ... units of joule per coulomb, or volt
an electromagnet is a current-carrying coil of wire wrapped around an _______ core, which intensifies the induced magnetic field iron
the net effect of an electric generator is to convert _______ energy into _______ energy mechanical into electric
transformer law Vs / Vp = Ns / Np (voltage of secondary circuit divided by voltage of primary circuit = windings of the secondary coil divided by windings of primary coil)
faraday's law: the magnitude of the induced current depends on: the _______ of the magnetic field as it moves past the conductor velocity
faraday's law: the magnitude of the induced current depends on: the _______ of turns in the conductor number
an _______ motor powers the rotating anode of the x-ray tube induction
varying magnetic field intensity induces an _______ current electric
faraday's law: the magnitude of the induced current depends on: the _______ of the conductor to the magnetic field angle
electric motor changes _______ energy into _______ energy electric into mechanical
transformer with a turns ratio greater than 1 step-up transformer
electromagnetic induction: an electric current is induced in a circuit if some part of that circuit is in a _______ magnetic field changing
transformer's turns ratio Ns / Np (windings of the seconday coil divided by windings of primary coil)
transformer where current on secondary side is smaller than current on primary side step-up transformer (Is < Ip)
transformer that confines even more of the magnetic field lines of the primary winding because the secondary winding is wrapped around it and there are essentially two closed cores: more efficient than closed-core shell-type transformer (sideways 8 with coil along middle)
changes the intensity of alternating voltage and current transformer (must be AC)
type of transformer built about a square core of ferromagnetic material closed-core (square with primary coil on one side and secondary coil on the other)
transformer with a turns ratio less than 1 step-down transformer
effect of transformer law effect on current (formula) Is / Ip = Np / Ns or Is / Ip = Vp / Vs
transformer where current on secondary side is larger than the primary current step-down transformer (Is > Ip)
transformer that condists of an iron core with only one winding of wire about it; this single winding acts as both the primary and the secondary winding autotransformer (single stick with coiling wire)

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