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Radiography > Chaper 4-Electricity > Flashcards

Chaper 4-Electricity Flashcards

1
Q

The number of electrons flowing in an electric circuit would describe the

A

Amp

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2
Q

_____ is the study of stationary electric charges

A

Electrostatistics

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3
Q

The amount of amperage transmitted in a direct current, series circuit of 50 volts and 5 ohms would be

A

10 mAs

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4
Q

Which would offer the greatest resistance to a series circuit?

A? Short, thick conductor
B? Long, thin conductor

A

B

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5
Q

What material would be the least effective as an electrical insulator

Copper, Wood, or Glass

A

Copper

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6
Q

List three ways to electrify and object

A

A. Friction
B. Contact
C. Induction

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7
Q

In a direct current circuit, how many volts would be required to transit 5 Amos through resistances of 3 ohms, 5 ohms, and 8 ohms wired in series?

A

80 volts

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8
Q

What would express voltage in a circuit?

A

Amps X resistance

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9
Q

The equation for the “Power Rule”?

A

P=I or W=VA

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10
Q

Four Electrostatic Laws

A

A. Likes repel, opposites attract
B. Electric Charge Distrubution
C. Coulombs Law
D. Electric Charge Concentration

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11
Q

What is the equation for “Power Loss”?

A

P=I2 X R

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12
Q

In space, flux lines from a magnet travel from:

A

North to South

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13
Q

What is the unit of electrical resistance?

A

Ohm

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14
Q

Wha is he unit of potential difference?

A

Volt

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15
Q

Contact confers the _____ charge

A

Same

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16
Q

Induction corners the _____ charge

A

Opposite

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17
Q

Ground potential equals ______

A

0

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18
Q

Primary function of X-Ray unit=convert _____ energy into electromagnetic energy of x-ray beam.

A

Electric

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19
Q

Converts chemical to electrical energy

A

Battery

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20
Q

Converts electrical to mechanical energy

A

Motor

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21
Q

Converts to electrical to heat/thermal energy

A

Toaster/stove

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22
Q

Converts mechanical to electrical energy

A

Generator

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23
Q
  1. Are free to travel from outermost shell of an atom to the next.
  2. Possesses what charge?
A
  1. Electrons

2. -

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24
Q
  1. Fixed inside nucleus of atom and are NOT free to move.

2. Possesses what the of charge?

A
  1. Proton

2. +

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25
Q

Occurs when an object becomes charged by removal or addition of electrons

A

Electrification

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26
Q

Contact confers the __1__ charge.

Induction confers the __2__ charge.

A
  1. Same

2. Opposite

27
Q

Earth behaves as a huge reservoir for stray electrical charges=

A

Electrical ground

28
Q

Electrostatic force is directly proportional to product of charges and inversely proportional to square of distance between them

A

Coulomb’s law

29
Q

Most charges reside on __1__ surface and constituted along the __2__ of surface

A
  1. External

2. Sharpest

30
Q

Unit of electric potential

A

Volt

31
Q

AKA Electric potential. Higher voltage-higher potential.

A

EM

32
Q

Flow of electrons

A

Electric current

33
Q

Matter through which electrons flow easily

A

Conductors

34
Q

Matter that inhibits flow of electrons

A

Insulators

35
Q

Most ____ are good conductors

A

Metals

Ex silver, gold, copper

36
Q

Glass, clay, rubber, plastic are all examples of _______

A

Insulators

37
Q

Under some conditions behaves as an insulator and sometimes as a conductor

A

Semiconductors

38
Q

property of limited resistance to electron flow below a critical temperature.

A

Superconductivity

39
Q

Electrons flow on the ____ surface of a wire

A

Outer

40
Q

When resistance is controlled and electrons flow over a crossed path

A

Electric Circuit

41
Q

Length is _____ proportional to resistance

A

Directly

42
Q

Measures number of electrons flowing in electric circuit

A

Ampere/amp (A)

43
Q

Measures electric potential

A

Volts

44
Q

Unit of electrical resistance

A

Ohms

45
Q

Ohm’s law ______

A

V=IR

46
Q

All circuit elements are connected in a line along same conductor

A

Series

47
Q

__1__ of voltage across each circuit element=__2__ circuit voltage

A
  1. Sum

2. Total

48
Q

Has elements that bridge conductors rather than lie in a line along a conductor

A

Parallel Circuit

49
Q

__1__ of all CURRENTS through each circuit element=total __2__ current

A
  1. Sum

2. Circuit

50
Q

Does voltage change in a parallel circuit?

A

NEVER

51
Q

_____ NEVER changes in a SERIES circuit

A

Amperage

52
Q

DC=electrons flowing in _____ direction(s) along a conductor

A

One

53
Q

AC=current in which electrons ______ back an forth

A

Oscillate

54
Q

Horizontal or X-axis of waveform represents __1__. Vertical or y-axis represents __2__ of current

A
  1. Time

2. Amplitude

55
Q

For DC, electrons always flow in the same __1__ with same velocity, so DC is represented by a __2__ line.

A
  1. Direction

2. Horizontal

56
Q

_____ separation between line and time axis represents magnitude of current

A

VERTICAL

57
Q

Are series elements interdependent or independent

A

Interdependent

58
Q

Parallel elements are _____

A

Independent

59
Q

Waveform for AC is _____

A

Sine curve

60
Q

Electrons flow first in __1__ direction and then in __2__ direction

A
  1. Positive

2. Negative

61
Q

At one instant in time (point 0 on sine cuve), all electrons will be at __1__. Then they move in + direction with increasing __2__.

A
  1. Rest

2. Potential

62
Q

Electric power is measured in _____

A

Watts

63
Q

One watt=__1__ amp of current through an electric potential of __2__ volt

A
  1. One

2. One

64
Q

X-Ray machines need ______ kilowatts

A

20-100

Radiography (9 decks)

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