Rad115 > Week 4 Electrodynamics > Flashcards

Week 4 Electrodynamics Flashcards

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1
Q

A material that allows electrons to move is a(n)
-conductor
-inductor
-volt
-insulator

A

Conductor

*A conductor is a medium that allows electrons to move

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2
Q

mAs is
-another name for tube current
-the product of mA and exposure time
-related to the amount of radiation exposing the patient
-the product of mA and exposure time, and related to the amount of radiation exposing the patient

A

-the product of mA and exposure time, and related to the amount of radiation exposing the patient

  • describes the amount of radiation leaving the x ray tube and exposing pt.
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3
Q

When a conductor has a smaller cross-sectional area:
-no options are correct
-resistance decreases
-resistance increases
-resistance remains the same

A

-resistance increases

*a conductor has a smaller cross sectional area and has more resistance

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4
Q

*The device that regulates the amount of current flowing in the circuit is the
-battery
-transformer
-fuse
-resistor

A

-resistor

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5
Q

The property of a circuit that impedes the flow of electrons is
-resistance
-electrostatics
-electric current
-electric potential

A

-resistance

*resistance is the property of a circuit that resists the flow of electrons

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6
Q

A device that converts mechanical energy to electrical energy is a
-generator
-transformer
-motor
-electromagnet

A

-generator

*the generator converts mechanical energy, such as wind or moving water, to electrical energy.

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7
Q

*Rubber is
-an excellent insulator
-an excellent conductor
-a week conductor
-a week insulator

A

-an excellent insulator

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8
Q

Mutual induction involves electricity being induced into a_______.
-moving magnetic field
-secondary coil
-primary coil
-no options are correct

A

-secondary coil

*mutual induction results in electricity being induced in the secondary coil of wire.

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9
Q

*A transformer with 100 times more turns on the secondary side as compared with the primary
-will have 100 times the current on the secondary side
-is a transformer that works on self induction
-is a step down transformer
-is a step up transformer

A

-is a step up transformer

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10
Q

Ohm’s law can be written as
- I=V/R
- R=I/V
- I=R/V
- R=IR

A

I=V/R

*or V=IR or R=V/I

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11
Q

Which of the following materials is a good conductor?
-copper
-plastic
-all options are good conductors.
-glass

A

Copper

*copper is an excellent conductor

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12
Q

The autotransformer
-uses two coils of wire
-uses self induction
-does not use a magnetic core
-is not typically found in an X-ray machine

A

Uses self induction

*the auto transformer is used in x ray equipment and operates based on self-induction, using one coil of wire.

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13
Q

Reducing the number of coils in the wire will result in
-reduced electromagnetic induction
-increased electromagnetic induction
-no effect on electromagnetic induction

A

-reduced electromagnetic induction

*less voltage is induced when there are fewer coils in the wire.

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14
Q

*A closed pathway of wired and related elements is a(n)
-rheostat
-diode
-fuse
-electric circuit

A

-electric circuit

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15
Q

The ampere is the unit of mesure for
-electric current
-electrostatics
-electric potential
-resistance

A

Electric current

*electric current is measured in amperes.

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16
Q

Slowing down the speed at which the conductor passes through the magnetic field results in
-no effect on electromagnetic induction
-reduced electromagnetic induction
-increased electromagnetic induction

A

-reduced electromagnetic induction

*less voltage is induced when the speed at which the coil of wire passes through the magnetic field is reduced.

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17
Q

A step down transformer results in
-increased current
-increased resistance
-increased voltage

A

-increased current

*A step-down transformer results in decreased voltage and increased current on the secondary side.

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18
Q

A device that temporarily stores charge is the
-fuse
-capacitor
-transformer
-rheostat

A

-capacitor

*the capacitor is an electronic device that stores an electric charge for a brief time.

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19
Q

*A device that converts electrical energy to mechanical energy is a
-electromagnet
-transformer
-motor
- generator

A

Motor

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20
Q

*A material that resists the movement of electrons is a(n)
-insulator
-ohm
-inductor
-conductor

A

Insulator

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21
Q

*When a conductor is longer:
-resistance increases
-resistance decreases
-no options are correct
-resistance remains the same

A

-resistance increases

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22
Q

The flow of electrons along a conductor is
-electric potential
-electrostatics
-electric current
-resistance

A

-electric current

*current is the flow of electrons along the conductor

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23
Q

Which of the following devices can increase or decrease voltage by a set amount?
-transformer
-capacitor
-battery

A

-transformer

*the transformer can increase or decrease voltage by a present amount

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24
Q

The study of electric charges in motion is
-electrostatics
-electromagnetism
-electronics
-electrodynamics

A

electrodynamics

*electrodynamics is the study of electric charges in motion

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25
Current that changes direction in the conductor is -alternating current -direct current -weak current -indirect current
-alternating current * alternating current is constantly changing direction in the conductor.
26
*A step up transformer results in -increased voltage -increased current Increased resistance
-increased voltage
27
Increasing the strength of the magnetic field results in -increased electromagnetic induction -no effect on electromagnetic induction - reduced electromagnetic induction
-increased electromagnetic induction *more voltage is induced with a stronger magnetic field strength
28
Which of the following is NOT a good electrical conductor? -water -copper -gold -glass
Glass *glass is not a good conductor of electricity; it’s used as an insulator
29
*Ohm’s law can be written as - volts = amps x ohms - no options are correct - ohms = volts x amps - amps = volts x ohms
- volts = amps x ohms
30
*With mutual induction, to include voltage in the secondary coil, there must be - direct current in the primary coil of wire -a physical connection between the two coils of wire -alternating current in the primary coil of wire
-alternating current in the primary coil of wire
31
Kilovoltage peak is abbreviated as -kPk -kVp -kP -kVPk
kVp *kilovoltage peak, describing the voltage used during X-ray production, is abbreviated kVp.
32
A batter produces -current that changes direction -indirect current -direct current -alternating current
-direct current *A battery produces current that flows in only one direction, direct current.
33
Electrons flow in the same direction in a steady stream that is what type of current
Direct current
34
Allows electricity to pass through easily
Conductors
35
Alter the voltage or amperage of electrical current
Transformer
36
Unit for power
Watt
37
Unit for potential difference or EMF
Volts
38
The rate at which work is done
Power
39
Unit for current
Apere
40
A materials ability to transmit electrical current
Conductivity
41
Convert alternating current to pulsating direct current
Rectifier
42
Resist the flow of electricity
Insulators
43
Total amount of electricity used for particular x-ray exposure
mAs
44
True or false, a generator converts electric electrical energy into, mechanical energy
False
45
In electrical circuits, one by one product of high resistance is
Heat
46
1 kg volt is equal to ____ volts
1000
47
There are 160 turns on the primary side of a transformer and 20,000 turns on the secondary side of a transformer. What is the turns ratio for this transformer?
125:1
48
The term electromagnetic induction refers to the production of
An electric circuit
49
Hans Oersted discovered that a magnet will be deflected by a nearby electrical current. This is the principle of operation for the:
Motor
50
What unit is defined as the rate of one coulomb per second?
Ampere
51
What must happen to current if resistance in a circuit is increased in order to maintain voltage
Decreases
52
When Both the rotor and stator may have windings it is :
. induction motor
53
Calculate the current in a circuit with a voltage of 9V and a resistance of 2 ohms.
4.5 A
54
The secondary coil of a transformer has 20,000 turns; the primary coil has 500 turns and is supplied with 120 V and 600 mA. What is the resulting secondary mA?
15 mA
55
The unit of electrical potential is the
Volt
56
Current that flows first in a positive direction and then in a negative direction is called.
Alternating current
57
What type of loader is used to rotate the x-ray tube anode?
Induction motor
58
An auto transformer operates on the principle of
Self induction
59
A transformer with more turns in primary winding than the secondary winding would be expected to
Decrease the voltage and increase the amperage
60
What is the voltage in a circuit if current is 300A and the resistance is for ohms?
1.2 kV
61
As the length of the wire increases the resistance of the wire
Increases
62
What is the power expended in a light bulb in a 100 V circuit with 0.6 A flowing?
60 W
63
The unit of electric current is the
Ampere
64
In an electrical circuit electrons are supplied by
Conductor
65
In a secondary coil of a transformer, induced electrical current will always flow in the opposite direction from the current supplied to the primary coil. This:
Is known as lenz’s law
66
A transformer can operate only on direct current true or false
False
67
Anything that converts, mechanical energy into electrical energy is a
Generator
68
What are the three components of an electrical circuit?
-energy source of voltage -conductive path of wires, -resistor
69
What happens in a parallel circuit if one of four branches fail?
Circuit remains closed and electrons flow through the remaining branches
70
If a transformer is supplied with 120 V and has 200 turns of wire in the primary coil and 40,000 turns of wire in the secondary coil, what will be the resultant voltage in the secondary coil?
24,000 V
71
What is the resistance of a circuit in the voltage is 100 V and the current is five A?
20 ohms
72
Milliamperes is the unit used to measure:
The flow rate of electrons in a circuit
73
Alternating current is required for any device that operates on the basis of electromagnetic:
Induction
74
In any transformer, the change in amperage is always______ The turns ratio of the transformer
Inversely proportional to
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