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Elecs > Electricity And Magnetism > Flashcards

Electricity And Magnetism Flashcards

1
Q

Cannot be reduced

A

Element

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2
Q

Chemically combined

A

Compound

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3
Q

Smallest particle
Consist of proton and neutron

A

Atom

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4
Q

Mass of proton over electron

A

1836

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5
Q

Atomic number of an electron is determined by

A

Number of protons

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6
Q

Formula for atomic weight

A

proton + # neutrons

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7
Q

Formula for number of electrons in a shell

A

Ne = 2n²

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8
Q

Inner to outer
7 shells per atom

A

Orbit / shell

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9
Q

Atom loses, gain electrons

A

Ionization

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10
Q

electrons removed from valence

A

Free electron

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11
Q

Energy gap of a semicon is in the order of

A

One electron volt

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12
Q

Classification of materials

A

Conductor
Instulator
Semiconductor

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13
Q

Energy gap in the order of 0V

A

Conductor

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14
Q

Energy gap in the order of 5eV

A

Insulator

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15
Q

In between insulator and conductor
Energy gap in 1eV

A

Semiconductor

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16
Q

Energy gap of silicon

A

1.1eV

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17
Q

Energy gap of germanium

A

0.67eV

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18
Q

Good material conductor have __ valence electron

A

1

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19
Q

Presence of electric charge

A

Electricity

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20
Q

Electricus

A

Amber

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21
Q

Flow of field length

A

Positive to negative

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22
Q

Electron flow

A

Negative to positive

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23
Q

Hole flow (conventional)

A

Positive to negative

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24
Q

Charged body at rest
Attraction or repulsion

A

Electrostatics

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25
Q

Unlike charges attract, like repel

A

1st law of electrostatics

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26
Q

2nd law of electrostatics

A

Coulombs law

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27
Q

Size of force is directly proportional to the value of charge

A

Coulombs law

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28
Q

Varies inversely as the square of distance

A

Coulombs 2nd law

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29
Q

Force per unit charge
Space between and around charged bodies

A

Electric field

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30
Q

Electrostatics lines of force are drawn in

A

Entering negative charge, leaving positive charge

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31
Q

Unit of measure of e fielď strength per unit length is known as e field intensity or e intensity

A

Volt/ meter (V/m)
Joules/ coulomb-meter (J/cm)
Newton/ coulomb (N/c)

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32
Q

How does permittivity affect e field intensity

A

Inversely proportional
It causes field intensity to decrease

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33
Q

Easiest way to accumulate static charge

A

Friction between 2 Insulators

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34
Q

Type of contact electrification in which certain material become electrically charged after they come into contact with another diff material through friction

A

Triboelectric effects

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35
Q

Static charge that can be stored by your body as you walk across a carpet

A

Over 30,000 volts

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36
Q

Charged bodies in motion and varying e fields

A

Electrodynamics

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37
Q

Due to ionization of electrons

A

Random drift

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38
Q

Due to potential difference

A

Directed drift

39
Q

Any directional movement of e charges such as electrons

A

Electric current

40
Q

Rate of free electrons flow

41
Q

Diff in potential between two paointd that represents the work involved or energy released in the transfer of ____

A

Potential difference

42
Q

Opposes or limit the flow of current or charge

A

Resistance

43
Q

Reciprocal of resistance

A

Conductance

44
Q

Unit of conductance

A

Siemens or mho

45
Q

Factors affecting resistance

A

Type of material
Length
Cross-sectional area of material
Temp

46
Q

Does not affect resistance

47
Q

Resistance of conductor changes with

A

Temperature

48
Q

The greater the diameter of a wire, the ____ is the resistance

49
Q

Ohm’s law

50
Q

Best conductor of electricity

51
Q

Stores electric charge

A

Capacitance

52
Q

Opposes charge in voltage

A

Capacitance

53
Q

Stires energy in the form of electrostatic fields

A

Capacitance

54
Q

Reciprocal of resistance and its unit is ___

A

Elastance
Daraf

55
Q

Capacitance has a property that opposes

56
Q

Simple capacitor

A

2 copper plates separated by iron (sheet of mica)

57
Q

Voltage required to charge 1.4uF capacitance to 5.6uC

58
Q

Factors that determines the capacitance

A

Material between plates
Area
Number of plates
Spacing

59
Q

Poor conductor of electricity but efficient supporter of electrostatic field

A

Dielectric

60
Q

Stores in the form of magnetic field

A

Inductance

61
Q

Factors affecting inductance

A

Number of turns
Length
Cross-sectional area of the core
Material

62
Q

Not practical for fabrication in an IC

63
Q

Characteristic of inductor

A

Opposes change in current

64
Q

Attracts pieces of iron

65
Q

Outside of magnet

A

North to south

66
Q

Inside of magnet

A

South to north

67
Q

Analogous to voltage

A

Magnetomotive force (mmf)

68
Q

Magnetic potential

69
Q

Units of mmf

A

SI = ampere-turns (AT)
CGS = Gilberts (Gb)
1 AT = 0.4 Gb = 1.26 Gb

70
Q

Magnetic field length, magnetizing force

A

Magnetic field intensity (H)

71
Q

Units of magnetic field intensity

A

SI = At/m
CGS = Oersted, Oe = Gb/cm
1 At/m = 0.0126Oe

72
Q

Total number of magnetic lines leaving or entering the pole of magnet

A

Magnetic flux

73
Q

Analogous to current

A

Magnetic flux

74
Q

Units of magnetic flux

A

SI = weber
CGS = Maxwell or lines
1 weber = 1×10⁸ Maxwell

75
Q

Nymber of m field lines per unit area of a SECTION perpendicular to the directionof flux

A

Flux density

76
Q

Counterpart of flux density

A

Current density

77
Q

Units of flux density

A

SI = Teska from Wb/m²
CGS = Gauss from Maxwell/cm²
1 Tesla = 1×10⁴ Gauss = Tesla = Wb/m²

78
Q

The lagging effect between the flux density of the material and the magnetizing force producing it

A

Hysteresis

79
Q

Ability of a ferro material to withstand an external m field without becoming demagnetized

A

Coercivity

80
Q

Value of magnetization of a magnetic substance that remain within it even after the applied m field

A

Rententivity/ Remanence

81
Q

Ability of material to allow m flux to flow through it

A

Permeability

82
Q

If the flux density for a given mmf is half that of the magnetic field strength, what happens to the absolute permeability

A

Remains the same

83
Q

Opposition to m flux

A

Reluctance

84
Q

Analogous to resistance

A

Reluctance

85
Q

Reciprocal of reluctance is ____ which is analogous to conductance

86
Q

Can be magnetized by placing in a strong external magnetic field or by passing electrical current through the material

A

Ferromagnetic

87
Q

Slightly attracted by a magnetic field and do not retain the magnetic properties when the external field is removed

A

Paramagnetic

88
Q

Non-metals that exhibit magnetic properties

A

Ferrimagnetic

89
Q

Magnetic force due to current

A

Electromagnetism

90
Q

When a current carrying conductor is brohght into magnetic field, the force that moves the conductor depends upon ___

A

The value of current

91
Q

Law when an induced emf is set up whenever the magnetic field linking that circuit changes

A

Faradays’s first law

92
Q

Law when the magnitude of the induced emf in any circuit is propotional to the rate of change of the magnetic flux linking the circuit

A

Faraday’s second law

93
Q

The direction of an induced emf is always such that it tends to set up a current opposing the moyion or the change of flux responsible for inducing that emf

A

Lenz’ law

94
Q

When a conductor is moved across a magnetic field so as to cut through the lines of force (or flux),an emf is produced in the conductor

A

Electromagnetic induction

Elecs (3 decks)

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