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Electricity and Electrical Circuits > Electrical Units > Flashcards

Electrical Units Flashcards

0
Q

Milli

A

.001 or a thousandth

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1
Q

A potential difference between two points produces an __________.

A

Electric Field

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2
Q

Micro

A

.0000001 or a millionth

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3
Q

Kilo

A

1000 or a thousand

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4
Q

Mega

A

1,000,000 or a million

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5
Q

The largest voltages (tens of mega volts) on earth occur in ___________.

A

Clouds

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6
Q

_______ represents the pressure or driving force that impels the charge carriers to move.

A

Voltage

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7
Q

__________ is the flow of charge carries attempting to equalize the charge between two poles that have a potential difference.

A

Current

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8
Q

__________ is the measure of of the opposition that a circuit offers to the flow of electric current.

A

Resistance

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9
Q

The standard unit of resistance is the ________.

A

Ohm

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10
Q

The larger the current through a resistor the greater the __________ through that same resistor.

A

Electromotive Force (EMF)

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11
Q

When some metals are chilled to extremely low temperatures they become ____________ which are almost perfect, resistance-free conductors.

A

Superconductors

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12
Q

___________ is the ability a material has to conduct electricity.

A

Conductance

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13
Q

Conductance is measured in ___________.

A

Siemens

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14
Q

1 Siemens is ________ ohm

2 Siemens is ________ ohm

A

1

1/2

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15
Q

What is the formula for Siemens/Ohms?

A

Siemens = 1/Ohms

Ohms = 1/Siemens

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16
Q

Unlike with resistance, conductance will _____________ with wire length.

A

Decrease

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17
Q

Whenever current flows through a resistance, _________ results. This heat can be measured in _________ and represents electrical __________.

A

Heat

Watts

Power

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18
Q

What is the formula for Power?

A

Power = Volts x Current (P = V x I)

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19
Q

Pico

A

.0000000000001 or one trillionth

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20
Q

Nano

A

.0000000001 or one billionth

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21
Q

Energy is _________ dissipated over a period of time.

A

Power

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22
Q

Power is the rate at which __________ is expended.

A

Energy

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23
Q

Physicists measure energy in _________.

A

Joules

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24
Q

One joule is one ________ of power dissipated for one _________ of time.

A

Watt

Second

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25
Q

ERG

A

One ten millionth (.0000001) of a Joule

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26
Q

___________ is the cooling or heating capacity of air conditioning equipment.

A

British Thermal Unit or BTU (1055 Joules)

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27
Q

_____________ is the energy gained by a single electron in a energy field of 1 volt.

A

Electron Volt or eV is 1.6 x 10^-19 Volts or (.00000000000000000016)

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28
Q

Joules to BTU Formula

A

Joules x 1055 = BTU

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29
Q

BTU to Joules Formula

A

BTU x .000948 = Joules

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30
Q

kWh to Joules Formula

A

kWh x 3,600,000 (3.6 x 10^6) = Joules

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31
Q

Joules to kWh (kilo Watt hours) Formula

A

Joules x .000000278 (2.78 x 10^-7) = kWh

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32
Q

(Watt Hours) Wh to Joules Formula

A

Wh x 3600 = Joules

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33
Q

__________ current is current that always flows in the same direction.

A

Direct

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34
Q

_______ current reverses direction periodically exactly every 1/120 second. It goes thru a complete cycle every 1/60 second.

A

Alternating

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35
Q

The ________ voltage for an ac wave is never the same as the __________ maximum, or peak, voltage.

A

Effective

Instantaneous

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36
Q

For the common ac waveform the effective value is __________ times the peak value.

A

.707

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37
Q

The peak value of a common waveform is _________ times the effective value.

A

1.414

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38
Q

The __________ of the utility ac wave is 60 __________ (once every 1/60 seconds).

A

Frequency

Hertz

39
Q

Usually, but not always, ac waveforms are known as __________ wave or a ___________ wafeform.

A

Sine

Sinusoidal

40
Q

___________ is a process in which ac is changed to dc.

A

Rectification

41
Q

When a special core (like iron or any substance that can be readily magnetized) is placed inside a coil, this will greatly increase the magnetic field. Such substances are called ___________.

A

Ferromagnetic

42
Q

The size of a magnetic field is measured in units called _________.

A

Webers

43
Q

One weber is mathematically equivalent to one _________.

A

Volt second

44
Q

One __________ is equivalent to .00000001 (one hundredth millionth) of a weber or .01 micro volt second.

A

Maxwell

45
Q

Whenever an electric current flows a ____________ field accompanies the current.

A

Magnetic

46
Q

Magnetic fields have lines of ________ that surround the wire in circles.

A

Flux

47
Q

The ___________ density of a magnetic field is given in terms of webers or maxwells per square meter or per square centimeter.

A

Flux

48
Q

A __________ has one weber per square meter (1 Wb/m2) a flux density

A

Tesla

49
Q

One __________ is equal to .0001 weber or one maxwell per square centimeter.

A

Gauss

50
Q

The greater the electric current through a wire, the greater the ___________ near the wire.

A

Flux Density

51
Q

A __________ wire will produce a greater flux density than a straight wire.

A

Coil

52
Q

Sometimes magnetic field strength is specified by ______ turns, a unit of __________ force.

A

Ampere

Magnetomotive

53
Q

A one turn wire loop, carrying a 1 amp of current, produces a field of _____ At (ampere turn).

A

One (Turns x Current = At (Ampere turns))

54
Q

Another unit of magnetomotive force is the _______.

A

Gilbert = .796 At (Ampere turns)

55
Q

The unbalanced FORCE that imparts an ACCELERATION of 1 METER PER SECOND SQUARED to a MASS of 1 kilogram

Equation:
Force = 1 Kg x m/s^2

A

Newton (N)

56
Q

________ results when a FORCE acts over a DISTANCE

Joules ( _____ ) = N (FORCE) x m (DISTANCE)

A

Work

57
Q

Work and ________ use the JOULE as the unit a measurement

A

Energy

58
Q

The RATE at which WORK is done OR the RATE at which ENERGY is changed from one form to another

Joules / sec

A

Power (W)

59
Q

Quantity: ________
Symbol: Q, q
SI Unit: Coulomb
Abbreviation: __

A

Electric Charge

C

60
Q

Quantity: _______
Symbol: R
SI Unit: ____
Abbreviation: Ω

A

Resistance

Ohms

61
Q

Quantity: _________
Symbol: G
SI Unit: Siemens
Abbreviation: ___

A

Conductance

S

62
Q

Quantity: Electric Potential
Symbol: _____
SI Unit: Volt
Abbreviation: V

A

V

63
Q

Quantity: Inductance
Symbol: ___
SI Unit: ________
Abbreviation: H

A

L

Henry

64
Q

Quantity: Capacitance
Symbol: C
SI Unit: ____
Abbreviation: F

A

Farad

65
Q

Quantity: Frequency
Symbol: f
SI Unit: _______
Abbreviation: ___

A

Hertz

Hz

66
Q

Quantity: Force
Symbol: F, f
SI Unit: __________
Abbreviation: ___

A

Newton

N

67
Q

Quantity: Energy/Work
Symbol: W, w
SI Unit: ________
Abbreviation: ___

A

Joule

J

68
Q

Quantity: Power
Symbol: P, p
SI Unit: ______
Abbreviation: ____

A

Watt

W

69
Q

Quantity: Magnetic Flux
Symbol: Ø
SI Unit: ________
Abbreviation: ___

A

Weber

Wb

70
Q

Quantity: Length
Symbol: ________
SI Unit: ______
Abbreviation: _____

A

L, l

Meter

m

71
Q

Quantity: Mass
Symbol: M, m
SI Unit: ______
Abbreviation: ____

A

Kilogram

kg

72
Q

Quantity: Time
Symbol: T, t
SI Unit: _____
Abbreviation: ___

A

Seconds

s

73
Q

Quantity: Current
Symbol: I, i
SI Unit: ________
Abbreviation: _____

A

Ampere

A

74
Q

Quantity: Magnetic Flux Density
Symbol: B
SI Unit: _______
Abbreviation: ___

A

Tesla

T

75
Q

Prefix: pico
Factor: _____
Symbol: p

A

10^-12

.000000000001 (Trillionth)

76
Q

Prefix: ____
Factor: 10^-9
Symbol: __

A

nano

n

.000000001 (Billionth)

77
Q

Prefix: micro
Factor: _________
Symbol: µ

A

10^-6

.000001 (Millionth)

78
Q

Prefix: milli
Factor: _______
Symbol: ______

A

10^-3

m

.001 (Thousandth)

79
Q

Prefix: _______
Factor: 10^-2
Symbol: _____

A

centi

c

.01 (Hundredth)

80
Q

Prefix: deci
Factor: ____
Symbol: ___

A

10^-1

d

.1 (Tenth)

81
Q

Prefix: ______
Factor: 10^3
Symbol: ___

A

kilo

k

1000 (Thousand)

82
Q

Prefix: ____
Factor: 10^6
Symbol: ____

A

mega

M

1000000 (Million)

83
Q

Prefix: giga
Factor: _______
Symbol: G

A

10^9

1000000000 (Billion)

84
Q

Prefix: ___
Factor: _______
Symbol: T

A

tera

10^12

1000000000000 (Trillion)

85
Q

Prefix: yocto
Factor: _____
Symbol: y

A

10^-24

.000000000000000000000001 (Septillionth)

86
Q

Prefix: zepto
Factor: 10^-21
Symbol: ____

A

z

.000000000000000000001 (Sextillionth)

87
Q

Prefix: atto
Factor: ______
Symbol: a

A

10^-18

.000000000000000001 (Quintillionth)

88
Q

Prefix: femto
Factor: ______
Symbol: ____

A

10^-15

f

.000000000000001 (Quadrillionth)

89
Q

Prefix: deka
Factor: _____
Symbol: ____

A

10^1

D

10 (Ten)

90
Q

Prefix: hecto
Factor: ____
Symbol: ____

A

10^2

h

100 (Hundred)

91
Q

Prefix: peta
Factor: ____
Symbol: ____

A

10^15

P

1000000000000000 (Quadrillion)

92
Q

Prefix: exa
Factor: ____
Symbol: E

A

10^18

1000000000000000000 (Quintillion)

93
Q

Prefix: zetta
Factor: _____
Symbol: Z

A

10^21

1000000000000000000000 (Sextillion)

94
Q

Prefix: yotta
Factor: ______
Symbol: _____

A

10^24

1000000000000000000000000 (Septillion)

Electricity and Electrical Circuits (6 decks)

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