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ASVAB > ELECTRONICS > Flashcards

ELECTRONICS Flashcards

Electronics

1
Q

What do volts measure?

A

The difference of potential between two points.

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2
Q

What do amperes (amps) measure?

A

The number of electrons that move past a specific point in one second.

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3
Q

What do ohms measure?

A

Resistance, including anything that could limit the flow of electrons.

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4
Q

What is a current?

A

Something that occurs when electrons move from one place to another.

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5
Q

What is the purpose of a conductor?

A

It allows electrons to move freely.

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6
Q

What does an insulator do?

A

Discourage electric currents.

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7
Q

What does a watt measure?

A

Power, the rate at which electrical energy is consumed or formed into another type of energy.

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8
Q

What is a watt-hour?

A

The amount of energy used in one hour at a rate of one watt.

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9
Q

What is a kilowatt-hour?

A

Most electricity is measured in this. It’s how much energy you would use of you ran a 1000 watt (1kilowatt) device for an hour

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10
Q

How do you find watt-hours?

A

Multiply wattage by time (hours)

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11
Q

What is a circuit?

A

The path of an electrical current

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12
Q

What supplies the voltage in a circuit?

A

The battery

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13
Q

What is a current?

A

Something that occurs when electrons move from one place to another.

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14
Q

What is the purpose of a conductor?

A

It allows electrons to move freely.

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15
Q

What does an insulator do?

A

Discourage electric currents.

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16
Q

What does a watt measure?

A

Power, the rate at which electrical energy is consumed or formed into another type of energy.

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17
Q

What is a watt-hour?

A

The amount of energy used in one hour at a rate of one watt.

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18
Q

What is a kilowatt-hour?

A

Most electricity is measured in this. It’s how much energy you would use of you ran a 1000 watt (1kilowatt) device for an hour

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19
Q

What do volts measure?

A

The difference of potential between two points.

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20
Q

What do amperes (amps) measure?

A

The number of electrons that move past a specific point in one second.

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21
Q

What do ohms measure?

A

Resistance, including anything that could limit the flow of electrons.

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22
Q

What is a current?

A

Something that occurs when electrons move from one place to another.

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23
Q

What is the purpose of a conductor?

A

It allows electrons to move freely.

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24
Q

What does an inulator do?

A

Discourage electric currents.

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25
Q

What does a watt measure?

A

Power, the rate at which electrical energy is consumed or formed into another type of energy.

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26
Q

What is a watt-hour?

A

The amount of energy used in one hour at a rate of one watt.

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27
Q

What is a kilowatt-hour?

A

Most electricity is measured in this. It’s how much energy you would use of you ran a 1000 watt (1kilowatt) device for an hour

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28
Q

How do you find watt-hours?

A

Multiply wattage by time (hours)

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29
Q

What is a circuit?

A

The path of an electrical current

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30
Q

What supplies the voltage in a circuit?

A

The battery

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31
Q

What is ground?

A

Any part of a circuit that measures 0 volts.

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32
Q

How do you measure volts in a circuit?

A

A voltmeter or multimeter.

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33
Q

What is a cell?

A

A storage compartment for electricity in a battery.

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34
Q

What is an electrical current?

A

The rate of flow of electrons in a conductor.

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35
Q

What do coulombs measure?

A

Charge. It is the amount of electricity provided by a current of one amp flowing for one second.

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36
Q

What does an amp represent?

A

The strength of a current.

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37
Q

What is an ammeter?

A

Measures the flow of current through a circuit.

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38
Q

What determines the number of amps along a wire?

A

The amount of voltage and the resistance in a circuit.

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39
Q

What is a circuit breaker?

A

a device thy automatically interrupts the electrical current

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40
Q

What is a rheostat?

A

It varies the resistance without opening the circuit. It absorbs all the electricity an application doesn’t use. ( dimmer switch)

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41
Q

What does an ohm represent?

A

The amount of resistance that interferes with the flow.

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42
Q

How is resistance measured?

A

By dividing the voltage measured at any given point (voltmeter) by the amount of current at the same point in a circuit (ammeter)

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43
Q

What three influences are present in a current flowing through a wire?

A
  1. ) amount of voltage (volts)
  2. ) resistance to the current (ohms)
  3. ) amount of current (amps)
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44
Q

What is ohms law?

A

The current in a circuit is directly proportional to the applied voltage an inversely proportional to the circuit resistance.

45
Q

What is the formula for currents (amps)?

A

Current=voltage/resistance or I=E/R

46
Q

What is the formula for voltage (volts)?

A

Voltage=current X resistance or E=IR

47
Q

What is the formula for resistance (ohms)?

A

Resistance= voltage/current or R=E/I

48
Q

In a circuit, electricity follows the path of…

A

least resistance

49
Q

What is a conventional current?

A

The flow of electricity from the negative terminal to the positive terminal.

50
Q

What is a short circuit?

A

When any wire accidentally crosses over another wire, causing the electricity to bypass the rest of the circuit and not follow the intended path.

51
Q

How is a chemical effect produced?

A

A current passes through a chemical compound and breaks that compound up.

52
Q

What is an electrolytic decomposition?

A

A chemical effect

53
Q

What is electroplating?

A

A process used to cover objects with a very thin, coating of metal.

54
Q

How is a heat effect produced?

A

Conducting electricity causes wires to become heated. Heat develops because the current must overcome the resistance of the wire.

55
Q

How is a magnetic effect produced?

A

When a wire is introduced to a magnetic field, electricity flows though the wire and creates a magnetic field that repels a magnet.

56
Q

What is an electromagnetic induction?

A

A magnetic effect

57
Q

How is a physiological effect produced?

A

Current passes through your muscles and causes the muscle to contract.

58
Q

what is a direct current?

A

A current that only flows in one direction.

59
Q

What is an alternating current?

A

A current that constantly changes dierention in a regular pattern.

60
Q

What is the frequency of an ac?

A

The number of times an ac changes direction per second.

61
Q

What is a hertz?

A

Unit of measurement for frequency.

62
Q

What is the Capacitance property?

A

The storage of energy that occurs in a nonconductor. This property resists any change in voltage in a circuit.

63
Q

What is the Inductance property?

A

It causes an electromotive force to be induced in a circuit.

64
Q

How is impedance expressed?

A

Electromotive force/current

65
Q

What is electromotive force?

A

Voltage

68
Q

What is a transistor?

A

A semiconductor that controls the flow of electricity in a circuit that can amplify a signal. Usually made of germanium or silicone.

68
Q

What is rectification?

A

The process of changing alternating currents to direct currents.

69
Q

What is a rectifier?

A

A circuit that performs rectification.

70
Q

What are semiconductor diodes?

A

Components made of a material with conductivity somewhere between that of a conductor and an insulator.

71
Q

What are diodes?

A

Conduct electricity in only one dicrection.

72
Q

What are three terminals in a transistor?

A
  1. ) Base
  2. ) Collector
  3. ) Emitter
73
Q

What is an emittor?

A

A voltage output

74
Q

What is base?

A

Controls the flow of current through a transmittor.

75
Q

What is a collector?

A

A voltage input.

76
Q

What is a complex system?

A

Two circuits combined.

77
Q

What is a block diagram?

A

Shows the various combined circuits that form a complex system.

78
Q

What is an inductor?

A

A coil of wire that creates a magnetic field when current passes through it.

79
Q

What is push switch?

A

Allows current to pass flow only when the button is pushed. (doorbell)

80
Q

What is a push-to-break switch?

A

The circuit is normally closed (device is on), and the circuit is open (device is off) only when the button is pressed.

81
Q

What is a on/off switch?

A

Allows current to flow only when it’s in the closed (on) position.

82
Q

What is a two-way switch?

A

Directs the flow of current to one of two routes, according to it’s position.

83
Q

What is a dual on/off switch?

A

Often used to switch main electricity because it can isolate both the live and neutral connections.

84
Q

What is a relay switch?

A

An electrically operated switch that may operate multiple switches at one time. Current flowing through a coil sets up a magnetic field, which causes the lever(s) to move, effectively changing the (relay) switch’s position(s).

85
Q

What is the value of a black band?

A

0

86
Q

What is the value of a brown band?

A

1

87
Q

What is the value of a red band?

A

2

88
Q

What is the value of an orange band?

A

3

89
Q

What is the vallue of a yellow band?

A

4

90
Q

What is the value of a green band?

A

5

91
Q

What is the value of a blue band?

A

6

92
Q

What is the value of a violet band?

A

7

93
Q

What is the value of a gray band?

A

8

94
Q

What is the value of a white band?

A

9

95
Q

What do the bands on a resistor represent?

A

The first and second bands are the first two digits in the resistor’s value. The next band is the multiplier (number of zeros after the first two numbers). (OHMS)

96
Q

What does a gold or silver band after the first two bands indicate?

A

Tolerance.

97
Q

What are three variable resistors?

A
  1. ) Rheostat
  2. ) Potentiometer
  3. ) Preset Variable Resistor
98
Q

What are nonvariable resistors?

A

Color bands.

99
Q

What is a rheostat?

A

A variable resistor with two contacts usually used to control current. (LAMP BRIGHTNESS)

100
Q

What is a potentiometer?

A

A variable resistor with three contacts used to control voltage.

101
Q

What is a preset variable resistor?

A

A device that operates with a small screwdriver or similar tool; designed to be set when the circuit is made and then left without further adjustment.

102
Q

What is a capacitor?

A

Stores electric charge. Used with resistors in timing circuits because it takes time for a capaacitor to fill with charge. Also used to filter circuits because they easily pass AC signals but they block DC signals.

103
Q

What is a polarized capacitor?

A

Must be connected the correct way in a circuit.

104
Q

What is a variable capacitor?

A

Used in radio tuning circuits.

105
Q

What is a diode?

A

Allows electricity to only flow in one direction. The electrical version of a valve.

106
Q

What is a light-emmitting diode(LED)?

A

Emmits a light when an electrical current passes through it.

107
Q

What is a zener diode?

A

Allows current to flow in the opposite direction after a threshold is met.

108
Q

What is a transistor?

A

Amplifies currents.

109
Q

What is an amplifier?

A

A complex circuit used to maginify power, current, or voltage.

110
Q

What is an antenna?

A

A device designed to recieve and/or transmit radio signals.

ASVAB (5 decks)

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