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Physics 2

QuestionAnswer
Power = (2 formulas) Current x voltage P=IV P= work/time (Watts)
units of power watts
1 ampere = 1 coulomb/sec
Ohms is the units for resistance
the smallest unit of charge exist between the electron and proton
electric charge is measured in coulomb
one coulomb is equal to the electric charge of 6.25 x 10^8 electrons
the three methods of electrification friction, conduction, and induction
Coulombs law the closer two charges are, the stronger the force between them -inverse square
the distribution principle of electrostatics states that the electric charge lies on the external surface of a conductor. and that the electrons move away from each other
electrons concentrate on the ____ curve and ___ surface sharpest; roughest
why do only electrons move along a solid conductor because protons are bound in the nucleus
anode is on the __ side while cathode is on the __ side left; right
a conventional current flows positive to negative
the actual electron flow is right to left, cathode to anode
AC vs DC alternating current direct current
Example of conductors gold and copper
example of insulators rubber an dglass
what electric materials are used in MRI semiconductors and superconductors
An AC current waveform is represented by a sinusoidal or sine wave
A DC waveform never drops below 0
1 kv = 1000 V
What determines ELECTRON speed and xray penetrability volts
opposition of the current to flow resistance
4 factors that affect resistance temp, material used, length, and cross sectional diameter
relationship between length of travel and resistance direct
relationship between cross sectional diameter and resistance inverse. more space means less resistance as less collision
unit of electric potential volts
how many volts does an xray machine require 220V
range of electric power in xray machines 50-150kW
two types of circuits series circuit and parallel circuit
this type of circuit maintains the same current but its voltage increases with new connections. resistance also increases with length series circuit
this type of circuit has branches, maintains voltage but its current increases parallel
downsides to each circuit series: resistance increases because current stays the same, electricity interrupted when one element fails. parallel: current increases with more branches, possibility of heat and overload or fire.
safeguard that is a metal tab that melts with heat fuse
safeguard that is a switch that pops open and can be reset circuit breaker
safeguard used by xray imaging systems so they dont overload Rheostats
Ohms law the relationship between current. resistance, and voltage
Ohms law states that Voltage = current x resistance V=IR
Ampere is the unit of current
which aspect of electrodynamics most affects contrast of the image Force -->energy of the electrons --> kVp
which aspect of electrodynamics most affects receptor exposure quantity --> number of electrons --> mA
velocity = units d/t m/s
acceleration = units Vf-V0/t m/s2
Newtons laws 1-inertia 2-F=ma 3- equal and opposite
Force = units mass x acceleration Newtons
momentum (p) = units mass x velocity kg-m/s
who said an element was composed of identical atoms that reacted the same way chemically? dalton
Who concluded that electrons were an integral part of all atoms (plum pudding)? thompson
Who introduced the nuclear model, which described the atom as containing a positively charged nucleus surrounded by a negative cloud of electrons Rutherford
Who declared a miniature solar system in which the electrons revolved about the nucleus in prescribed orbits or energy levels Bohr
rate of rise and fall of a wave frequency
speed of light 3.0 x 10^8 m/s
the energy of a photon is related to its frequency
frequency = units c/wavelenght c= speed of light units= Hz
xray particle theory xrays behave as particles when interacting with matter
Plancks quantum theory xray photns energy is directly proportional to xray photon frequency
plancks constant 4.15 x 10^-15 eVs
Plancks equation E = hf E- photon energy (eV) h-plancks constant f- frequency (Hz)
Created by: user-1989152
 

 



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