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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
Neutral voltage increases when neutral line resistance increases
Neutral line resistance
26
A ____ or ____ in the neutral wire introduces an infinite resistance.
Break and open
27
Body resistance Dry hand to dry hand = ____ Damp hand to damp hand = ____ Internal Organs = ____.
100,000 ohms 35,000 ohms 100 to 400 ohms
28
Average workers skin resistance is broken down by approximately __ volts
50
29
____ wires must always be jumpered before opening.
Neutral
30
What are the two theories concerning current flow
Electron flow theory Conventional current flow theory
31
The _____ theory states that since electrons are negative particles, current flows from the most negative point in the circuit to the most positive point
Electron Flow Theory
32
The ______ theory is the one most often used and states that current flows from the most positive point to the most negative.
Conventional Current Flow
33
____ states that it takes one volt to push one ampere through one ohm.
Ohm’s Law
34
All ____ quantities are proportional to each other and therefore can be expressed as mathematical formulas.
Electric
35
What are the three types of electrical circuits
Closed Circuit Short Circuit Grounded Circuit
36
When current flows through a conductor, a ______ is created around the conductor.
Magnetic field
37
When a conductor is cut by a magnetic field, a _____ is induced in the conductor.
Voltage
38
The ____ of the world induced voltage is determined by the ____ of the magnetic field in relation to the direction of motion.
Polarity
39
What are the three factors that determine the amount of induced voltage?
Number of turns of wire Strength of the magnetic field Speed of the cutting action
40
_____ ______ is always opposite in polarity to the applied voltage
Induced voltage
41
Inductors ____ a change of current
Oppose
42
Inductors can produce extremely ___ voltages when the current flowing through them is stopped
High
43
Three devices used to help prevent large voltage spikes are
Resistors Varistors Diode
44
____ is the total opposition to current flow in an electric circuit
Impedance
45
In a pure inductive circuit, the _____ lags the _____ by 90 degrees
Current, voltage
46
In a pure inductive circuit, however, no true power or watts is produced.
Inductive circuit
47
An electrical measurement called _______ is used to measure the reactive power in a pure inductive circuit
Volts-amperes-reactive (VARS)
48
_____ voltage is proportional to the rate of change in current
Induced
49
Induced voltage is always ____ in polarity to the applied voltage
Opposite
50
Series Circuit Rules
Current = same at any point in circuit Resistance total = sum of all resistors Voltage (E) = sum of voltage drop across all resistors (load)
51
Parallel Circuit Rules
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
Prefix - micro (ų)
0.000,001
53
Prefix - kilo (K)
1,000
54
Prefix - mega (M)
1,000,000
55
Prefix - milli (m)
0.001
56
All values of a transformer are proportional to its _____
Turn ratio
57
The power value for a capacitor is measured in ____
VARS
58
A meter reads 122 volts AC when plugged in at a wall outlet? This voltage is ____
RMS
59
A capacitor store energy in ____
Electrostatic field
60
Current can flow only when a capacitor is _____ or _____
Charging Discharging
61
Principal parts of a atom
Electrons Protons Neutrons
62
Protons have a _____ charge
Positive
63
Electrons have a ____ charge
Negative
64
Neutrons have ____ charge
No
65
What law states opposites charges attract and like charges repel
Law of charges
66
What is the flow of electrons
Electrons current
67
_____ is produced when an electron from one atom knocks electrons from another atom out of orbit
Electron current
68
Materials that permit electrons to flow through them easily
Conductors
69
Materials that resist the flow of electrons
Insulators
70
Electrons in the outermost electron orbit
Valence
71
Materials that contain between 1 and 3 valence electrons l
Conductors
72
Materials that contain 7-8 valance electrons
Insulators
73
Most common method to used to produce electricity
Magnetism
74
Static electricity is a charge because there is no current flow until it is ____
Discharged
75
Six basic methods of producing electricity are
Magnetism Chemical action Light Heat Pressure Friction
76
A ________ occurs when a path to ground other then the intended path is established
Ground fault
77
What is the most importance rule of electrical safety?
Do not become the victim yourself
78
______ are devices that oppose a change in voltage
Capacitors
79
What are the three factors that determine the capacitance of a capacitor are
The surface area of the plates The distance between the plates The type of dielectric used
80
A capacitor stores energy in an ________
Electrostatic field
81
The basic unit of capacitance is the _____
Farad (F)
82
When capacitors are connected in _____, their capacitance values add
Parallel
83
When capacitors are connected in series, the _____ of the total capacitance is equal to the sum of the ______ of all the capacitors
Reciprocals
84
When a ______ is connected in an AC circuit, current appears to flow through the _____?
Capacitor
85
The current flow in a pure capacitive circuit is limited by _____ _____?
Capacitive reactance
86
Capacitive reactance is _____ ______ to the capacitance of the capacitor and the frequency of the AC line
Inversely proportional
87
Capacitive power is measured in ____, as in inductance.
VARs (Volt-Amp Reactive)
88
In pure capacitive circuit, the current leads the applied voltage by ___ degrees
90

Basic Electricity (1 decks)

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