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Xray 111 > Electrostatics And Electrodynamics > Flashcards

Electrostatics And Electrodynamics Flashcards

1
Q

What is the principle reservoir for excess electric charge?

A

The Earth

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2
Q

Regarding the movement of an electric charge from one atom to another atom

A

Usually outer shell electrons move

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3
Q

What is electrostatics

A

Concerns resting electric charges

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4
Q

Coulomb’s law states that electrostatic force is

A

Inversely proportional to the square of the distance between changes

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5
Q

What are the 3 methods of electrification

A

Contact, induction, and friction

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6
Q

Static electricity can

A

Make ones hair stand on end

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7
Q

The unit of electrostatic charge is

A

Coulomb

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8
Q

The principle electrostatic law states that

A

An electron will repel an electron

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9
Q

Objects become electrified because of

A

The transfer of electrons

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10
Q

The phenomenon of lighting occurs when

A

One cloud is positive electrified and an adjacent one is negatively electrified

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11
Q

What are the five electrostatic laws?

A

1: like charges repel and unlike charges attract
2: the electrostatic force between two charges is directly proportional to the product of their quantities and inversely proportional to the square of the distance between them
3: Electric charges reside only one the external surface
4: the concentration of charges on a curved surface of a conductor is greatest where the curvature is greatest
5: only negative charges are free to move in solid conductors

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12
Q

An electrostatic force is created when an

A

Proton approaches a proton

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13
Q

When a copper conductor becomes electrified

A

A kink in the wire will have high surface electrification

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14
Q

When 2 objects touch permits electrons to move from one object to another

A

Contact

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15
Q

Electrical fields acting on one another without contact

A

Induction

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16
Q

The only charges that can move on solid conductors

A

Negative

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17
Q

The concentration of charges on a curved surface of a conductor is greatest where

A

The curvature is greatest

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18
Q

Reside only on external surface of conductors

A

Electric charges

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19
Q

Inversely proportional to the distance squared

A

The electrostatic force

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20
Q

The greater the electrostatic charge on each object the greater the

A

Electrostatic force

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21
Q

Electrostatic force between two charges is directly proportional to the product of their magnitudes and inversely proportional to the square of the distance between them

A

Coulomb’s law

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22
Q

Points outward from positive charge and into a negative charge

A

Electric field

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23
Q

Surrounding every changed body there is a region in which a force is exerted on another charged body

A

Electric field

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24
Q

The force of attraction of repulsion between charges

A

Electrostatic force

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25
Q

No electrostatic force in or not acted upon

A

Uncharged objects

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26
Q

Hass to be very cold and has a easy flow with hardly any resistance

A

Superconductors

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27
Q

Off and on and it sometimes allows flow

A

Semiconductor

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28
Q

Allow free flow of negative charge

A

Conductor

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29
Q

Does not allow the flow of negative charge

A

Nonconductors or insulators

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30
Q

How readily it allows flow of negative charge is determined by

A

Atomic structure of object

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31
Q

Deficiency of electrons

A

Positively charges

32
Q

Excess of electrons

A

Negatively charge

33
Q

Process of removing or adding negative charges to a body of matter

A

Electrification

34
Q

If you have more electrons than protons it’s

A

Negative

35
Q

If you have more protons than electrons it’s

A

Positive

36
Q

If their are the same number of electrons and protons

A

Neutral

37
Q

Addition of an electron to a neutral atom gives it a

A

Negative charge

38
Q

If one or more electrons are removed the atom is

A

Positively charges

39
Q

All atoms contain what in motion around a nucleus

A

E-

40
Q

They are uncharged elementary particles found in the nucleus of a atom

A

Neutrons

41
Q

Electric charge deals with what charge since they are freely move able

A

Negative electric

42
Q

They are free to move from atom to atom because they are located outside the nucleus
Inner-shell are more tightly bound than putter-shell

A

Electrons

43
Q

They are fixed inside the nucleus of a atom and are not free to move

A

Protons

44
Q

The smallest unit of an electric charge is

A

Protons and elections

45
Q

Electric charges are measured in

A

Coulombs

46
Q

Electric charge is a property of

A

Matter

47
Q

The study of at rest electrical charges

A

Electrostatics

48
Q

The study of electric charges in motion

A

Electrodynamics

49
Q

For electric current to move there must be

A

Electric potential

50
Q

The ability to do work because of a separation of charges

A

Electric potential

51
Q

1 coulomb flowing by a given point in 1 second

A

Ampere

52
Q

Ampere May also be defined as

A

Amount of current

53
Q

The flow of charges particles

A

Electric current

54
Q

Flow in one direction

A

Direct current

55
Q

Oscillating back and forth

A

Alternating current

56
Q

The electrical resistance

A

Ohm

57
Q

That property of that element in a circuit that impedes the flow of electricity

A

Resistance

58
Q

Resistant depends on

A

Material, length, cross-sectional area, temperature

59
Q

Results in reduced flow of water

A

Resistance

60
Q

The unit of measure for frequency

A

Hertz

61
Q

Each cycle is

A

1/60th of a second

62
Q

X-axis

A

Time

63
Q

Y-axis

A

Amplitude of current

64
Q

A closed pathway composed of wires and circuit elements through which electricity may flow

A

Electric circuit

65
Q

The pathway for electricity must be what for electricity to be able to flow?

A

Closed

66
Q

What kind of circuit is one in which the pathway is broken, such as occurs when a switch is turned off

A

Open circuit

67
Q

A complex circuit that has different voltages and current flowing through different sections

A

A xray circuit

68
Q

A device that produces electrons through a chemical reaction, stores and electric charge for the long term and provides an electric potential

A

Battery

69
Q

A device that is like a battery in that it stores an electric charge but works very differently in that it cannot produce new electrons and stores the charge only temporarily

A

Capacitor

70
Q

Is a “one way valve” device and allows electrons to flow in o my one direction

A

Diode

71
Q

Act as emergency devices that break or open the circuit if there is a sudden surge of electricity to the circuit or device

A

Fuses, circuit, and breakers

72
Q

Simply a section a special wire, usually encased in glass, that quickly melts if the current flow rises excessively, thus opening the circuit

A

Fuse

73
Q

Acts in the same manner as a fuse, if the current flow rises excessively, the circuit breakers internal switch is tripped, stopping the flow of electricity

A

Circuit breaker

74
Q

Inhibits the flow of electrons

A

Resistor

75
Q

Adjustable or variable for of resistor

A

Rheostat

76
Q

Device that opens a circuit

A

Switch

77
Q

Device that can increase or decrease voltage

A

Transformer

Xray 111 (1 decks)

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