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Basic Electricity > Electricity > Flashcards

Electricity Flashcards

1
Q

Coulomb

A

Is a quantity measurement for electrons. Measurement of electric charge

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2
Q

Ampere

A

Standard measurement of electrical current.

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3
Q

Volt

A

The potential difference between two point of a conducting wire carrying constant current of one ampere when the power dissipated between these points is one watt

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4
Q

Electromotive Force (EMF)

A

Another name for voltage

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5
Q

Potential Difference

A

Another name for voltage

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6
Q

Coulomb force is repulsive

A

If polarities are the same

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7
Q

Coulomb force is attractive

A

Polarities are opposite

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8
Q

Coulomb force decreases

A

In proportion to the square of the distance between their charge centers

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9
Q

Ampere (A)

A

Is equal to one coulomb per second. Is the measurement of the amount electricity that is flowing through a circuit.

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10
Q

What must be present before current can flow

A

Voltage
Voltage cannot flow. Voltage pushes current through a wire.

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11
Q

The unit of resistance to current flow. All electric loads are measured in this

A

Ohm’s

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12
Q

___ is a measure of the amount of power that is being used in a circuit.

A

Wattage / Watt

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13
Q

____ is proportional to the amount of voltage and the amount of current flow.

A

Wattage

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14
Q

Factor of volts times amps

A

Watts

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15
Q

A voltmeter is hooked up in _____ to measure voltage in a circuit.

A

Parallel

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16
Q

An ammeter is hooked up in _____ to measure current in a circuit.

A

Series

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17
Q

The circuit MUST be de-energized prior to reading _____?

A

Resistance

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18
Q

____ is a very good way to check continuity of a circuit.

A

Resistance Measurement

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19
Q

All wire has ____

A

Resistance

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20
Q

Factors that determine how much resistance is added.

A

Type of material from which the wire is made.
Diameter of the conductor, or size of conductor.
The length of the conductor.
The temperature of the conductor.

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21
Q

Current flow requires

A

Complete Path - Circuit (amps)
Push - Voltage

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22
Q

All current on a circuit must return to its source

A

Current flow

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23
Q

Short Circuit Current - returns to the source through the neutral and earth

A

Fault current

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24
Q

Neutral current kept low, then voltage on neutral is low

A

Neutral current

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25
Q

Neutral voltage increases when neutral line resistance increases

A

Neutral line resistance

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26
Q

A ____ or ____ in the neutral wire introduces an infinite resistance.

A

Break and open

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27
Q

Body resistance
Dry hand to dry hand = ____
Damp hand to damp hand = ____
Internal Organs = ____.

A

100,000 ohms
35,000 ohms
100 to 400 ohms

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28
Q

Average workers skin resistance is broken down by approximately __ volts

A

50

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29
Q

____ wires must always be jumpered before opening.

A

Neutral

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30
Q

What are the two theories concerning current flow

A

Electron flow theory
Conventional current flow theory

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31
Q

The _____ theory states that since electrons are negative particles, current flows from the most negative point in the circuit to the most positive point

A

Electron Flow Theory

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32
Q

The ______ theory is the one most often used and states that current flows from the most positive point to the most negative.

A

Conventional Current Flow

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33
Q

____ states that it takes one volt to push one ampere through one ohm.

A

Ohm’s Law

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34
Q

All ____ quantities are proportional to each other and therefore can be expressed as mathematical formulas.

A

Electric

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35
Q

What are the three types of electrical circuits

A

Closed Circuit
Short Circuit
Grounded Circuit

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36
Q

When current flows through a conductor, a ______ is created around the conductor.

A

Magnetic field

37
Q

When a conductor is cut by a magnetic field, a _____ is induced in the conductor.

A

Voltage

38
Q

The ____ of the world induced voltage is determined by the ____ of the magnetic field in relation to the direction of motion.

A

Polarity

39
Q

What are the three factors that determine the amount of induced voltage?

A

Number of turns of wire
Strength of the magnetic field
Speed of the cutting action

40
Q

_____ ______ is always opposite in polarity to the applied voltage

A

Induced voltage

41
Q

Inductors ____ a change of current

A

Oppose

42
Q

Inductors can produce extremely ___ voltages when the current flowing through them is stopped

A

High

43
Q

Three devices used to help prevent large voltage spikes are

A

Resistors
Varistors
Diode

44
Q

____ is the total opposition to current flow in an electric circuit

A

Impedance

45
Q

In a pure inductive circuit, the _____ lags the _____ by 90 degrees

A

Current, voltage

46
Q

In a pure inductive circuit, however, no true power or watts is produced.

A

Inductive circuit

47
Q

An electrical measurement called _______ is used to measure the reactive power in a pure inductive circuit

A

Volts-amperes-reactive (VARS)

48
Q

_____ voltage is proportional to the rate of change in current

A

Induced

49
Q

Induced voltage is always ____ in polarity to the applied voltage

A

Opposite

50
Q

Series Circuit Rules

A

Current = same at any point in circuit
Resistance total = sum of all resistors
Voltage (E) = sum of voltage drop across all resistors (load)

51
Q

Parallel Circuit Rules

A

Current (It) = sum of the current that flows thru the individual branches
Resistance = < the resistance of the lowest value of resistors or branch in circuit. (Reciprocal resistors)
Voltage (E) = voltage drop is the same as applied voltage.

52
Q

Prefix - micro (ų)

A

0.000,001

53
Q

Prefix - kilo (K)

A

1,000

54
Q

Prefix - mega (M)

A

1,000,000

55
Q

Prefix - milli (m)

A

0.001

56
Q

All values of a transformer are proportional to its _____

A

Turn ratio

57
Q

The power value for a capacitor is measured in ____

A

VARS

58
Q

A meter reads 122 volts AC when plugged in at a wall outlet? This voltage is ____

A

RMS

59
Q

A capacitor store energy in ____

A

Electrostatic field

60
Q

Current can flow only when a capacitor is _____ or _____

A

Charging
Discharging

61
Q

Principal parts of a atom

A

Electrons
Protons
Neutrons

62
Q

Protons have a _____ charge

A

Positive

63
Q

Electrons have a ____ charge

A

Negative

64
Q

Neutrons have ____ charge

A

No

65
Q

What law states opposites charges attract and like charges repel

A

Law of charges

66
Q

What is the flow of electrons

A

Electrons current

67
Q

_____ is produced when an electron from one atom knocks electrons from another atom out of orbit

A

Electron current

68
Q

Materials that permit electrons to flow through them easily

A

Conductors

69
Q

Materials that resist the flow of electrons

A

Insulators

70
Q

Electrons in the outermost electron orbit

A

Valence

71
Q

Materials that contain between 1 and 3 valence electrons l

A

Conductors

72
Q

Materials that contain 7-8 valance electrons

A

Insulators

73
Q

Most common method to used to produce electricity

A

Magnetism

74
Q

Static electricity is a charge because there is no current flow until it is ____

A

Discharged

75
Q

Six basic methods of producing electricity are

A

Magnetism
Chemical action
Light
Heat
Pressure
Friction

76
Q

A ________ occurs when a path to ground other then the intended path is established

A

Ground fault

77
Q

What is the most importance rule of electrical safety?

A

Do not become the victim yourself

78
Q

______ are devices that oppose a change in voltage

A

Capacitors

79
Q

What are the three factors that determine the capacitance of a capacitor are

A

The surface area of the plates
The distance between the plates
The type of dielectric used

80
Q

A capacitor stores energy in an ________

A

Electrostatic field

81
Q

The basic unit of capacitance is the _____

A

Farad (F)

82
Q

When capacitors are connected in _____, their capacitance values add

A

Parallel

83
Q

When capacitors are connected in series, the _____ of the total capacitance is equal to the sum of the ______ of all the capacitors

A

Reciprocals

84
Q

When a ______ is connected in an AC circuit, current appears to flow through the _____?

A

Capacitor

85
Q

The current flow in a pure capacitive circuit is limited by _____ _____?

A

Capacitive reactance

86
Q

Capacitive reactance is _____ ______ to the capacitance of the capacitor and the frequency of the AC line

A

Inversely proportional

87
Q

Capacitive power is measured in ____, as in inductance.

A

VARs (Volt-Amp Reactive)

88
Q

In pure capacitive circuit, the current leads the applied voltage by ___ degrees

A

90

Basic Electricity (1 decks)

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