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Module 4, Lesson 3 > ITEC 220 Test #2 > Flashcards

ITEC 220 Test #2 Flashcards

1
Q

Series circuit

A

Circuit in which current flows in one direction

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2
Q

Parallel circuit

A

Circuit in which current flows in one direction then alternates back and forth

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3
Q

Combination circuit

A

A circuit with both series and parallel sections

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4
Q

Series-parallel/complex circuit

A

Circuits with any combination of series and parallel sections

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5
Q

How many paths are in a series circuit

A

1 path

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6
Q

What is the disadvantage of connecting a large number of bulbs in series

A

A voltage drop

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7
Q

Are lights in our homes connected in series

A

No in parallel

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8
Q

How many paths are there in a parallel circuit

A

2 or more paths

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9
Q

What is the smallest number of paths a parallel circuit can have

A

2 paths

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10
Q

D’Arsonval meter movement

A

A meter movement that uses stationary magnet structure and a moving coil

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11
Q

Moving-coil meter

A

A meter movement that uses stationary magnet structure and a moving coil

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12
Q

Rectifier

A

A device that allows current to go one direction easily, but not the other direction

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13
Q

Full-scale value

A

The current that represents the maximum deflection of the pointer on the scale

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14
Q

Current sensitivity

A

The method of stating the resistance need to limit current to the full-scale value

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15
Q

Ohms per volt

A

The unit stating sensitivity of a meter movement

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16
Q

Shunt resistor

A

A resistor in parallel to the meter movement that measures the current greater than the full-scale value

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17
Q

Multiplier resistor

A

A resistor in series to the meter movement that measures the voltage greater that the full-scale value

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18
Q

Kirchhoff’s Voltage Law

A

In a circuit, the algebraic sum of the voltage drop is equal to the algebraic sum of the voltage rises across the source

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19
Q

Kirchhoff’s current law

A

The sum of the currents entering the junction are equal to the sum of the currents leaving the junction

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20
Q

What is the maximum voltage that can be measured when using 100 volt setting

A

100 V

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21
Q

When using the 1,000 volt range, by what number must the scale reading be multiplied

A

100

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22
Q

Axial resistor

A

A cylindrical shaped resistor whose leads come out of its axis

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23
Q

Radial resistor

A

A cylindrical shaped resistor whose leads come out at the sides or at the radius of the cylinder

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24
Q

What is the purpose of the function selector switch on a multimeter

A

To select different voltages and currents

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25
Q

An ohmmeter measures resistance through a conductor and resistor through a

A

Series circuit

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26
Q

What would be the resistance of a section of insulating material

A

Infinite

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27
Q

What is indicated by the first and second color bands on a resistor

A

The first and second digits of the resistors value

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28
Q

What is indicated by the third and fourth color bands on a resistor

A

The third is the multiplier and the fourth is the resistors tolerance

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29
Q

Gold fourth band

A

Plus/minus 5%

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30
Q

Silver fourth band

A

Plus/minus 10%

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31
Q

No fourth band

A

Plus/minus 20%

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32
Q

Variable resistor

A

A resistor whose resistance can be changed without disconnecting the circuit

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33
Q

Rheostat

A

A variable resistor, which has two terminals, and is used to control the current in a circuit

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34
Q

Potentiometer

A

A variable resistor, which has three terminals, and is used as a adjustable voltage divider

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35
Q

What is rheostat used for

A

To control the current in a circuit

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36
Q

What is a potentiometer used for

A

as a adjustable voltage divider

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37
Q

What is the physical difference between a rheostat and a potentiometer

A

A rheostat has two terminals and a potentiometer has three terminals

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38
Q

To control the current through a lamp, is the rheostat connected in parallel or in series

A

Connected in series

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39
Q

Define Kinetic energy

A

Energy associated with motion

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40
Q

Define Power

A

The rate of expending energy (doing work)

41
Q

Basic unit of power

A

Watt

42
Q

Define watt

A

One watt is the amount of work done in one second by one volt in moving one coulomb of charge

43
Q

One Joule of energy is referred to as

A

A watt-second

44
Q

1 watt hour equals

A

3,600 joules

45
Q

Define horsepower

A

The mechanical unit of power

46
Q

The cold resistance of a light bulb is less than its hot resistance. Would it be more likely to burn out when first turned on or later

A

First turned on

47
Q

Residual magnetism

A

Magnetism that a material retains after the magnetizing force has been removed

48
Q

Poles

A

The ends of a magnet (labeled north and south)

49
Q

Magnetic field

A

Any region in which a magnetic force is exerted

50
Q

Ferromagnetic

A

Any material that exhibits strong magnetic properties

51
Q

Magnetism by induction

A

The magnetism a object acquires by being in a magnetic field

52
Q

Permanent/hard magnets

A

Material that retains much of the magnetism after the magnetic force has been removed

53
Q

temporary/soft magnets

A

Material that loses its magnetism after the magnetic force has been removed

54
Q

Permeability

A

Measure of the ability of a substance to conduct magnetic flux

55
Q

Reluctance

A

Ability of a material to oppose passage of magnetic lines of force through them

56
Q

Magnetic dipoles

A

Smallest particles of a substance that has magnetic properties

57
Q

1 kilowatt is…

A

1,000 watts

58
Q

To convert watts to kilowatts

A

Move the decimal three places to the left

59
Q

1 kilowatt-hour is…..

A

1,000 watt-hours

60
Q

To convert watt-hours to kilowatt-hours

A

Move the decimal three places to the left

61
Q

A watt is equivalent to

A

1 joule per second

62
Q

A unit of power (horsepower) is equivalent to

A

550 foot-pounds of work done in one second

63
Q

One watt is the same as an electromotive force of….

A

One volt multiplied by a current of one ampere

64
Q

Unlike poles of magnets attract or do not attract

A

Attract

65
Q

Is the pointer on the compass needle a north magnetic pole or a south magnetic pole

A

South magnetic pole

66
Q

Standing halfway between the equator and the south geographic pole of the earth, in which direction would the compass point

A

North

67
Q

All materials are affected when placed close to magnets

A

False

68
Q

The north pole of a magnet induces what pole into the end of a material attached to it

A

South

69
Q

How would you demagnetize a screw driver

A

Heat it up, hit it with a hammer, or put it in another magnetic field with AC current

70
Q

Two ferromagnetic substances

A

Nickle and Cobalt

71
Q

Two non-ferromagnetic substances

A

Chrome and Zinc

72
Q

Electromagnetism

A

The phenomenon whereby an electrical current produces magnetic effects

73
Q

Coil / Solenoid

A

An electrical device that consists of turning insulated wires that produce a magnetic field

74
Q

Is a magnetic field around a wire temporary of permanent

A

Temporary

75
Q

The intensity of a magnetic field is (directly, inversely) proportional to the distance from a conductor

A

Inversely

76
Q

Winding more turns on a coil will (increase, decrease) the magnetic field

A

Increase

77
Q

Electromagnet

A

Is a device that behaves as a magnet when external power is applied to it.

78
Q

What is an example of a electromagnet

A

A solenoid with a soft iron-core

79
Q

Relay

A

A device that is operated by changing conditions of one electric circuit to affect the operation of devices in the same circuit or different ones

80
Q

Why is an electromagnet preferred over a permanent magnet

A

It can be turned off and used in mechanical apps

81
Q

Electromagnets are why type of magnets

A

Temporary magnets

82
Q

What must you have to operate an electromagnet

A

External power and a solenoid with soft iron-core

83
Q

What is another name for a electromechanical switch

A

Relay

84
Q

Induced voltage / Induced current

A

Voltage produced in a conductor by its movement in a magnetic field

85
Q

In what direction must a conductor be moved to induce maximum current into the conductor

A

Perpendicular

86
Q

What can be done to a conductor to increase the current induced into it when it is moved through a magnetic field

A

Move the conductor at right angles

87
Q

What effect does the use of a steel core have with respect to induced current

A

The steel core only picks up part of the magnetic field

88
Q

When current in a coil is neither increasing or decreasing, what is the state of the field surrounding the coil

A

Remains in a steady state

89
Q

Why does a current-carrying wire move when in a magnetic field

A

Because there is a magnetic field around the wire

90
Q

Name some uses of current-carrying conductors moving in a magnetic field

A

Motors, generators, and transformers

91
Q

Left hand rule

A

Determines the direction of the induced current in the conductor

92
Q

What do the fingers represent in the left hand rule

A

Thumb - motion of conductor, Index finger - location of magnetic field, and middle finger - direction of the current flow

93
Q

Right hand rule

A

Determines the motion of the current-carrying conductor in a magnetic field

94
Q

What do the fingers represent in the right hand rule

A

Thumb - motion of the conductor, Index finger - the direction of the magnetic field, and middle finger - the direction of current flow

95
Q

How can an electric bell be made into a buzzer

A

Remove the hammer and bell

96
Q

Uses of a buzzer

A

Attention-getting device and doorbell replacement

97
Q

What is meant by normally opend contacts on a relay

A

Normally open contacts are when the relay coils are deenergized. They close when the relay coil is energized

98
Q

What is the purpose of a circuit breaker

A

It protects a circuit from an excessive-current condition

Module 4, Lesson 3 (18 decks)

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