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Electronics Information > Electronics Information > Flashcards

Electronics Information Flashcards

1
Q

Alternating current is so called because

A

the current changes direction many times per second

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2
Q

An electric current is

A

a form of energy

a flow of electrons

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3
Q

A battery

A

always produces a direct current

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4
Q

In a series circuit, total voltage drop equals

A

the sum of the individual voltage drops

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5
Q

A volt is a unit of electric(al)

A

pressure

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6
Q

The transformor depends on the relationsip between electricty and

A

magnetism

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7
Q

In an electric motor, magnets

A

repel each other

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8
Q

A circuit without resistance is called

A

a short circuit

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9
Q

A transformer changes the _______ in a circuit

A

current and voltage

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10
Q

In a series circuit, a switch controls

A

all devices on the circuit

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11
Q

Which is the same at all points in a parallel circuit

A

voltage

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12
Q

A switch in a series-parallel circuit controls

A

some or all devices

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13
Q

The purpose of dopant in a semiconductor is to make it act as a(n)

A

insulator or conductory

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14
Q

Electricity

A

a form of energy that can travel invisibly

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15
Q

Tiny negative charges that orbit the nucleus of an action

A

electrons

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16
Q

Conductor

A

a material that allows an easy flow of electrons

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17
Q

Good conductors

A

silver
copper
aluminum

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18
Q

Material that resists the flow of electrons

A

insulator

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19
Q

Good insulators

A

rubber
plastic
ceramic

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20
Q

A loop of conductor that tkes electricity from it’s source to the load and back to the source

A

circuit

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21
Q

Load

A

anything in the circuit such as a heater, a light, or motor that uses power

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22
Q

Direrct current (DC)

A

a steady flowiwng type of electricity produced by batteries and used in flashlights, boom boxes and computers

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23
Q

Alternating Current (AC)

A

type of current that changes direction many times per second (used in homes)

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24
Q

A branch of science that deals with complicated uses of electricity, such as radios, televisions, and computers

A

electronics

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25
Q

Electric current

A

the amount of electrons flowing through a conducting material

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26
Q

Amount of power consumed by an electrical device

A

electric power

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27
Q

Voltage

A

force that afects the rate at which electricity flows through a conductor

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28
Q

Sometimes called electrical pressure

A

voltage

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29
Q

Tells how much electrical pressure is used in a part fo the circuit

A

voltage drop

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30
Q

Frequency

A

the number of complete alternations-from one direction to the other and then back again-that alternating current makes per second

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31
Q

The opposition of a material to the flow of electricity through it

A

resistance

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32
Q

If a circuit does not have resistance, wires can overheat, this is called

A

a short circuit

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33
Q

Ohm’s law

A

describes the relationship among electircal pressure (voltage) current strength (amperage) and resistance (ohm’s) in any circuit

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34
Q

Amperes =

A

volts/ohms

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35
Q

Volts =

A

amperes x ohms

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36
Q

Ohms =

A

volts/amperes

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37
Q

Electric power

A

watts = volts x amperes

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38
Q

Amperes =

A

watts/volts

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39
Q

If a transformer has more turns of wire on the output side it is a

A

step up transformer

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40
Q

In a stepdown transformer

A

there are more turns on the input side and the output voltage is smaller than the input voltage

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41
Q

The same machines operating backwards

A

motors and generators

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42
Q

Changes rotating energy (kinetic) into electric energy

A

a generator

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43
Q

Motor

A

changes electric energy into kinetic energy

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44
Q

What drives a motor

A

the changes in polarity

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45
Q

The two types of magnets in a motor

A

rotor and stator

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46
Q

Spins inside the stator

A

Rotor (usually an electromagnet)

47
Q

Stator

A

stationary magnet

48
Q

In motors which poles attract

A

opposite, north attracts south but repels north

49
Q

A device that can briefly store electricity

A

a capacitor

50
Q

A resistor

A

creates resistance to the flow of electrons

51
Q

If a circuit does not have any resisitance it is called

A

a short circuit

52
Q

Changes the voltage and amperage of a current

A

a transformer

53
Q

Transformers work by

A

changing electricity into magnetism, then back into electricity

54
Q

How many coils does a transformer have

A

2

55
Q

Stores electricty as chemical energy that can be readily converted into electric current

A

a battery

56
Q

Batteris can be wet (like car batteries) or dry (like flashlight batteries)

A

Batteris can be wet (like car batteries) or dry (like flashlight batteries)

57
Q

Always make Direct current (DC)

A

batteries

58
Q

Some batteries can be recharged depending on

A

their chemistry

59
Q

What travels through a circut to make an electric current

A

electro chemiclal reactions between the cathode and the carbon electrode at the center, resulting in free electrons

60
Q

Exists only when electon can flow through a circuit

A

electric current

61
Q

What are the types of circuits

A

series circuits

parallel circuits

62
Q

All moving electrons pass through every part of the circuit including all the loads and swithches is a

A

series circuit

63
Q

The quality of electrons

A

current

64
Q

Is the same at all points of the circuit

A

current

65
Q

Drops a sthe current goes through each device

A

voltage

66
Q

The total voltage of the loads must equal the voltage of the

A

circuit

67
Q

The loads are placed between the two supply wires so that they all get teh same voltage in a

A

parallel circuit

68
Q

A switch controls the current in the entire circuit in a

A

Series circuit

69
Q

Current can flow through only loads even if one is switched off in a

A

parallel circuit

70
Q

Current is the same at all points in a

A

series circuit

71
Q

Voltage is the same at all points in a

A

parallel circuit

72
Q

How do you find total resistance in a series circuit

A

add teh resisitance of each load

73
Q

To calculate the total resistance in a parallela circuit you

A

add the inveres of the reisitance

74
Q

Combines features of series and parallel circuits

A

series-parallel circuit

75
Q

The branch circuits that bring electric power to the lights and outlets are

A

series-parallel

76
Q

Can act as a conductor or as an insulator

A

semiconductor

77
Q

The main semiconductor that is the basis for computer memory and logic boards

A

silicon

78
Q

Applied to silicon to determin whether it will act as an insulator or as a conductor by making electons available or not available to flow

A

dopants

79
Q

When electrons can flow, a material becomes a

A

conductor

80
Q

The basis for computer applications is a group of components called

A

transistors and diodes

81
Q

Transistors

A

devices that can switch a current, regulate its flow, or amplify a current, all based on the prescence of a smaller current

82
Q

Devices that allow a current to flow in one direction only

A

diodes

83
Q

Diodes are also used in devices that convert AC into DC. These devices are called

A

rectifiers

84
Q

Breaking up the load in the building into a number of circuits is a function of the

A

circuit breaker box

85
Q

The circuit breaker box

A

prevents excess current from flowign into the circuits

breaks up the load in the building into a number of circuits

86
Q

Simple circuits have what two separate conductors

A

hot and grounded

87
Q

The hot conductor can be another color but it is usually

A

black

88
Q

The grounded (sometimes called neutral) conductor is

A

white

89
Q

Black and white wires together are called

A

supply wires

90
Q

circuits can be shut off by

A

the fuses and circuit breakers

91
Q

Home wiring systems are usually rated

A

15 or 20 amperes

92
Q

15 ampere circuits require

A

14 gauge wires

93
Q

Larger 12 gauge wires are required for

A

20 ampere circuits

94
Q

Always wants to complete a circuit

A

electricity

95
Q

Two options for returning current to the circuit breaker or fuse box are

A 
white wire (grounded) is the normal path
bare wire (equipment grounding) is the alternate path of something goes wrong with the grounded wire
96
Q

Conduit

A

steel sheath or wires that protect bare wire

97
Q

Brings current

A

black wire

98
Q

Drains current away

A

white wire

99
Q

Electric plugs that can fit into the socket in only one way because one lug on the plug is bigger than the other is called a

A

polarized plug

100
Q

Turns electic circuits on and off

A

switches

101
Q

One single-pole switch controls a circuit

A

One single-pole switch controls a circuit

102
Q

Two three-way switches can work together to control a circuit from either fo two locations

A

such as at the top and bottom of a stairs

103
Q

Continuously controls the voltage, and is used to dim lights

A

a rheostat

104
Q

In home wiring switches alwasy control the hot side of the circuit

A

(the one that supplies the current)

105
Q

If electrical connections are not secure and tight what will develop causing heat and ruining the connection

A

arcs will develop

106
Q

Solder

A

a connection where metal is melted over a connection

107
Q

Flux

A

a chemical that prevents oxidation from happening when wires get heated

108
Q

Breaks the circuit (cuttng off the power) when something goes wrong is the job of the

A

circuit breakers and fuses

109
Q

Usually has an electomagnet that opens a circuit when the current gets too high

A

a circuit breaker

110
Q

Has an element that melts when the current is too high

A

fuse

111
Q

Can be reset after they trip

A

circuit breakers

112
Q

Coaxial

A

having the same axis

113
Q

Cables that have an inner and outer conductor and are usually used in cable TV systems are called

A

coaxial cables

Electronics Information (1 decks)

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