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trisemester 3 TCC > week 4 Phycs.DX.IM > Flashcards

week 4 Phycs.DX.IM Flashcards

1
Q

a moving charged particle creates a

A

magnetic field

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2
Q

induced current is defined as

A

creating a relative movement between a conductor and a magnetic field

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3
Q

result of induced current

A

movement of e- in the conductor, creating an induced electromotive force or current

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4
Q

relative movement

A

comparing one object spatial relationship to another

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5
Q

if you generate e- what is produced?

A

current

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6
Q

static magnetic field means what?

A

it is a static/steady current

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7
Q

what happens to the magnetic field with an AC current with each voltage cycle?

A

it will expand and collapse

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8
Q

In induced velocity what has to move in order for the e- to move

A

magnetic field or the conductor

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9
Q

turns ratio will change

A

the voltage and amperage between the 2 circuits

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10
Q

induced current occurs in the

A

secondary coil

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11
Q

transformers operate on the principle of

A

induced current

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12
Q

Transformers use induced current principle to change

A

voltage and amperage of a circuit.

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13
Q

turns ratio

A

number of turns (circles of wire) around the primary coil vs. number of turns around in the secondary coil

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14
Q

voltage and amperage are_____ and _________ related across a transformer

A
  1. inversely

2. proportionately

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15
Q

as volts go up what happens to amperes?

A

amperes go down

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16
Q

transformer allow you to change

A

amperes and voltage

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17
Q

mechanical support of tube

A

tube stand

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18
Q

Location of tube is

A

inside

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19
Q

grid is what partion of xray?

A

what xray passes through

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20
Q

cassette of xray contains

A

film

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21
Q

collimator does what on the xray film

*

A

limits the size of the beam xraying a certain portion of body

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22
Q

x-rays first pass through

A

mirror

23
Q

second stage of xray passes through what?

A

passes through the shutters

24
Q

________ and a ______ are also part of the collimator to project a pattern of visible light accurately demonstrating the area which will be irradiated

A
  1. light source

2. mirror

25
Q

central ray is defined as a ?

A

imaginary photon right in the middle of the xray beam

26
Q

knife light tells us the what about the central ray?

A

level of the central ray

27
Q

3 key exposure variables

A

time
tube current
tube potential

28
Q

line compensation

A

correction of in out of voltage to machine

29
Q

most xrays are taken between

A

60 - 100 kev

30
Q

autotransformer is made of

A

one set of windings

31
Q

high voltage transformers change

A

Volts –> kilovolts

32
Q

x ray housing reduces

A

the spread of radiation throughout by limiting radiation emission from the tube

33
Q

x-rays leave the housing through a

A

port

34
Q

glass may become

A

electroplated

35
Q

the envelope is made up of

A

glass

36
Q

cathode is known as an

A

e- emitter

37
Q

what are the 2 parts of the cathode

A

filament and focusing cup

38
Q

focusing cup does what

A

focuses the e- to a single point

39
Q

thermionic emission

A

tungsten wire will emit e- when heated by passage of a low amperage current

40
Q

filament =

A

thoriated tungsten wire coil

41
Q

anode side is the electrode ethat is

A

positive side of tube

42
Q

greater the charge impacts force how?

A

greater the force of the e-

43
Q

rotor is the portion that

A

rotates and is made up of copper and molybdenum

44
Q

focal spot

A

limited area of target receives e- at any given spot

45
Q

larger filament =

A

larger focal spot

46
Q

smaller filament =

A

smaller focal spot

47
Q

the effective focal spot size is _____ than actual focal spot size

A

less

48
Q

actual size of focal spot is going to appear

A

smaller than it actually is

49
Q

actual focal spot size

A

area struck by e- at any given instance during exposure

50
Q

smaller focal size/smaller filament increases

A

resolution

51
Q

magnitude of induced current depends on

A
  • Strength of magnetic field
  • Velocity magnetic field moving past conductor
  • Angle of conductor to magnetic field
  • Number of turns in the conductor
52
Q

in a transformer the primary coil is connected to what and creates what?

A

connected to an AC source creating an expanding and collapsing electromagnetic field.

53
Q

what happens in the primary coil vs secondary coil?

A

primary coil: creates a expanding/collapsing electromagnetic field.

Secondary creates: induced current

trisemester 3 TCC (25 decks)

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