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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
Occurs when an object becomes charged by removal or addition of electrons
Electrification
26
Contact confers the __1__ charge. | Induction confers the __2__ charge.
1. Same | 2. Opposite
27
Earth behaves as a huge reservoir for stray electrical charges=
Electrical ground
28
Electrostatic force is directly proportional to product of charges and inversely proportional to square of distance between them
Coulomb's law
29
Most charges reside on __1__ surface and constituted along the __2__ of surface
1. External | 2. Sharpest
30
Unit of electric potential
Volt
31
AKA Electric potential. Higher voltage-higher potential.
EM
32
Flow of electrons
Electric current
33
Matter through which electrons flow easily
Conductors
34
Matter that inhibits flow of electrons
Insulators
35
Most ____ are good conductors
Metals | Ex silver, gold, copper
36
Glass, clay, rubber, plastic are all examples of _______
Insulators
37
Under some conditions behaves as an insulator and sometimes as a conductor
Semiconductors
38
property of limited resistance to electron flow below a critical temperature.
Superconductivity
39
Electrons flow on the ____ surface of a wire
Outer
40
When resistance is controlled and electrons flow over a crossed path
Electric Circuit
41
Length is _____ proportional to resistance
Directly
42
Measures number of electrons flowing in electric circuit
Ampere/amp (A)
43
Measures electric potential
Volts
44
Unit of electrical resistance
Ohms
45
Ohm's law ______
V=IR
46
All circuit elements are connected in a line along same conductor
Series
47
__1__ of voltage across each circuit element=__2__ circuit voltage
1. Sum | 2. Total
48
Has elements that bridge conductors rather than lie in a line along a conductor
Parallel Circuit
49
__1__ of all CURRENTS through each circuit element=total __2__ current
1. Sum | 2. Circuit
50
Does voltage change in a parallel circuit?
NEVER
51
_____ NEVER changes in a SERIES circuit
Amperage
52
DC=electrons flowing in _____ direction(s) along a conductor
One
53
AC=current in which electrons ______ back an forth
Oscillate
54
Horizontal or X-axis of waveform represents __1__. Vertical or y-axis represents __2__ of current
1. Time | 2. Amplitude
55
For DC, electrons always flow in the same __1__ with same velocity, so DC is represented by a __2__ line.
1. Direction | 2. Horizontal
56
_____ separation between line and time axis represents magnitude of current
VERTICAL
57
Are series elements interdependent or independent
Interdependent
58
Parallel elements are _____
Independent
59
Waveform for AC is _____
Sine curve
60
Electrons flow first in __1__ direction and then in __2__ direction
1. Positive | 2. Negative
61
At one instant in time (point 0 on sine cuve), all electrons will be at __1__. Then they move in + direction with increasing __2__.
1. Rest | 2. Potential
62
Electric power is measured in _____
Watts
63
One watt=__1__ amp of current through an electric potential of __2__ volt
1. One | 2. One
64
X-Ray machines need ______ kilowatts
20-100

Radiography (9 decks)

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