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Key Terms Chapt 4

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ampere
used to measure the rate of current flow in the circuit
atom
building blocks, in all matter, consist of 100 different subatomic prticles
binding energy
energy that holds a electron in each shell
chemical compound
a substance that consists of only one type of molecule
circuit
continuous path
conductor
metals that allows electric charges to drift or flow
current
is the quantity of electron flowing in a circuit
electromagnetic energy
consist of light, x-rays, radio waves, microwaves, and other forms of energy
electron
negative charge, fundamental particle that orbits nucleus of atom
element
is a substance made up of only one type of atom
frequency
is the number of times per second that a crest passes a given point
intensifying screen
plates coated with fluorescent crystals
ionization
produces an atom with an electric charge, neutral atom gains or loses an electron, protons and electron no longer equal
kilovolt peak kVp
used to measure the potential difference across an x-ray tube, equals 1000 volts
mass
quantity of matter that makes up any physical object
matter
everything of a physical nature in the universe
milliampere
equal to 1/1000 of an ampere (0.001 A)
molecules
two or more atoms may combine chemically to form this
neutron
neutral charge, fundamental particle in nucleus of atom
nucleus
formed by neutrons and proton of atom, its center
photon
the smallest possible unit of electromagnetic energy
potential difference
the force or strength of the electron flow in the current
proton
positive charge, fundamental particle of the nucleus of the atom
rectification
process that an alternating current can be converted so that it flows in one direction only
resistance R
any property of the circuit that opposes or hinders the flow of current
sine wave
repeating wave, sinusoidal form
transformer
device used to produce the high voltage needed for x-ray production
volt V
unit used to measure potential difference, one volt is the quantity of potential difference needed to cause a current of 1A to flow in a circuit with a resistance of 1ohm
wavelength
distance from one crest to the next