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"CE" E6 REGULAR EXAM SEP 2014 > NAVEDTRA 14173A NEETS MODULE 1 CHAPTER 3 > Flashcards

NAVEDTRA 14173A NEETS MODULE 1 CHAPTER 3 Flashcards

1
Q

According to Ohm’s law, what happens to circuit current if the applied voltage (a) increases, (b) decreases?

A

(a) Current increases (b) Current decreases

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2
Q

According to Ohm’s law, what happens to circuit current if circuit resistance (a) increases, (b) decreases?

A

(a) Current decreases (b) Current increases

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3
Q

What is the equation used to find circuit resistance if voltage and current values are known?

A

R = E/I

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4
Q

What is the term applied to the rate at which a mechanical or electrical force causes motion?

A

Power.

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5
Q

How can the amount of current be changed in a circuit?

A

By changing the circuit resistance or the voltage of the power source.

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6
Q

What are the three formulas for electrical power?

A

P = E x I, P = E to the second divided by R, P = I to the second x R

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7
Q

What is the current in a circuit with 5 ohms of resistance that uses 180 watts of power?

A

6 amperes.

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8
Q

What is the power used in a circuit that has 10 amperes of current through a 10-ohm resistor?

A

1 kilowatt.

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9
Q

How much power is converted by a 1-horsepower motor in 12 hours?

A

8,952 watt hours or 8.952 kWh.

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10
Q

What is the efficiency of the motor if it actually uses 9.5 kWh in 12 hours?

A

942 (rounded to 3 places).

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11
Q

A series circuit consisting of three resistors has a current of 3 amps. If R1 = 20 ohms, R2= 60 ohms, and R3 = 80 ohms, what is the (a) total resistance and (b) source voltage of the circuit?

A

(a) . 160 ohms

(b) . 480 volts

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12
Q

What is the voltage dropped by each resistor of the circuit described in question?
A series circuit consisting of three resistors has a current of 3 amps. If R1 = 20 ohms, R2= 60 ohms, and R3 = 80 ohms, what is the (a) total resistance and (b) source voltage of the circuit?

A 
E1 = 60 volts
E2 = 180 volts
E3 = 240 volts
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13
Q

If the current was increased to 4 amps, what would be the voltage drop across each resistor in the circuit described in question?
What is the voltage dropped by each resistor of the circuit described in question?
A series circuit consisting of three resistors has a current of 3 amps. If R1 = 20 ohms, R2= 60 ohms, and R3 = 80 ohms, what is the (a) total resistance and (b) source voltage of the circuit?

A 
E1 = 80 volts
E2 = 240 volts
E3 = 320 volts
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14
Q

What would have to be done to the circuit described in question 17 to increase the current to 4 amps?

A

The source voltage would have to be increased to 640 volts.

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15
Q

A series circuit consists of two resistors in series. R1 = 25 ohms and R2 = 30 ohms. The circuit current is 6 amps. What is the (a) source voltage, (b) voltage dropped by each resistor, (c) total power, and (d) power used by each resistor?

A

(a) 330 volts
(b) E1 = 150 volts
E2 = 180 volts
(c) 1.98 kilowatts
(d) P1 = 900 watts
P2 = 1.08 kilowatts

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16
Q

When using Kirchhoff’s voltage law, how are voltage polarities assigned to the voltage drops across resistors?

A

The point at which current enters the resistor is assigned a negative polarity and the point at which current leaves the resistor is assigned a positive polarity.

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17
Q

A circuit has a source voltage of 100 volts and two 50-ohm resistors connected in series. If the reference point for this circuit is placed between the two resistors, what would be the voltage at the reference point?

A

50 volts.

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18
Q

If the reference point in question (below) were connected to ground, what would be the voltage level of the reference point?
A circuit has a source voltage of 100 volts and two 50-ohm resistors connected in series. If the reference point for this circuit is placed between the two resistors, what would be the voltage at the reference point?

A

Zero volts.

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19
Q

What is an open circuit?

A

A circuit where there is no longer a complete path for current flow.

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20
Q

What is a short circuit?

A

An accidental path of low resistance which passes an abnormally high amount of current.

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21
Q

Why will a meter indicate more voltage at the battery terminal when the battery is out of a circuit than when the battery is in a circuit?

A

The internal (source) resistance of the battery will drop some of the voltage.

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22
Q

What condition gives maximum power transfer from the source to the load?

A

When the load resistance equals the source resistance.

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23
Q

A circuit has a source voltage of 25 volts. The source resistance is 1 ohm and the load resistance is 49 ohms. What is the efficiency of power transfer?

A

98% (12.25 watts / 12.5 watts X 100)

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24
Q

There is a relationship between total current and current through the individual components in a circuit. What is this relationship in a series circuit and a parallel circuit?

A

Total current in a series circuit flows through every circuit component but in a parallel circuit total current divides among the available paths.

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25
Q

In applying Kirchhoff’s current law, what does the polarity of the current indicate?

A

Whether the current is entering the junction (+) or leaving the junction (-).

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26
Q

Four equal resistors are connected in parallel; each resistor has an ohmic value of 100 ohms, what is the equivalent resistance?

A

25 ohms (Req = R/N )

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27
Q

Three resistors connected in parallel have values of 12 kΩ, 20 kΩ, and 30 kΩ. What is the equivalent resistance?

A

6 kΩ (Req = 1 divided by 1/R1 + 1/R2 + 1/R3 ) (use power of tens)

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28
Q

Two resistors connected in parallel have values of 10 kΩ and 30 kΩ. What is the equivalent resistance?

A

7.5 kΩ (Req = R1 X R2 / R1 + R2 )

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29
Q

What term identifies a single resistor that represents total resistance of a complex circuit?

A

Equivalent resistor or Req.

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30
Q

The total power in both series and parallel circuits is computed with the formula: PT = P1 + P2 + P3 +…Pn. Why can this formula be used for both series and parallel circuits?

A

In both cases all the power used in the circuit must come from the source.

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31
Q

A circuit consists of three resistors connected in parallel across a voltage source. Rl = 40Ω, R2 = 30Ω, R3 = 40Ω, and PR3 = 360 watts. Solve for RT, ES and IR2. (Hint: Draw and label the circuit first.)

A

RT = 12Ω ( 1RT= 1/R1+1/R2+1/R3)

ES = 120V (ES = ER3 = the root of Pr3 x r3

IR2 = 4A (IR2 = ES/ R2)

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32
Q

What is the effect on total resistance and total current in a circuit if an open occurs in (a) a parallel branch, and (b) in a series portion?

A

(a) Total resistance increases, total current decreases (b) Total resistance becomes infinite, total current is equal to zero

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33
Q

What is the effect on total resistance and total current in a circuit if a short occurs in (a) a parallel branch, and (b) in a series portion?

A

(a) Total resistance decreases, total current increases (b) Total resistance decreases, total current increases

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34
Q

If one branch of a parallel network is shorted, what portion of circuit current flows through the remaining branches?

A

None.

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35
Q

What information must be known to determine the component values for a voltage divider?

A

The source voltage and load requirements (voltage and current).

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36
Q

If a voltage divider is required for a load that will use 450 mA of current, what should be the value of bleeder current?

A

45 mA rule-of-thumb.

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37
Q

If the load in question below requires a voltage of +90 V, what should be the value of the bleeder resistor?
If a voltage divider is required for a load that will use 450 mA of current, what should be the value of bleeder current? (45 mA)

A

2 kΩ.

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38
Q

If the source voltage for the voltage divider in question below supplies 150 volts, what is the total current through the voltage divider?
If a voltage divider is required for a load that will use 450 mA of current, what should be the value of bleeder current? (45 mA)

A

495 mA.

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39
Q

In figure 3-67, why is the value of R1 calculated first?

A

R1 is the bleeder resistor. Bleeder current must be known before any of the remaining divider resistor ohmic values can be computed.

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40
Q

figure 3-67, how is (a) the current through R2 and (b) the voltage drop across R2 computed?

A

(a) By adding the bleeder current (IR1) and the current through load 1(b) By subtracting the voltage of load 1 from the voltage of load 2.

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41
Q

In figure 3-67, what is the purpose of the series-parallel network R3, R 4, and R5?

A

The series-parallel network drops the remaining source voltage and is used to take the place of a single resistor (75 ohms) when the required ohmic value is not available in a single resistor.

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42
Q

If the load requirement consists of both positive and negative voltages, what technique is used in the voltage divider to supply the loads from a single voltage source?

A

The ground (reference point) is placed in the proper point in the voltage divider so that positive and negative voltages are supplied.

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43
Q

Is it considered safe for a person to touch any energized low-voltage conductor with the bare hand?

A

NEVER! All energized electric circuits should be considered potentially dangerous.

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44
Q

What should you do if you become aware of a possible malfunction in a piece of electrical equipment?

A

You should immediately report this condition to a qualified technician.

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45
Q

Who should perform CPR?

A

Only trained, qualified personnel.

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46
Q

If circuit voltage is held constant, circuit current will react in what manner as the resistance (a) increases, and (b) decreases?

A

(a) Decrease (b) increase

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47
Q

If circuit resistance is held constant, circuit current will react in what manner as the voltage (a) increases, and (b) decreases?

A

(a) Increase (b) decrease

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48
Q

Which of the following terms applies to the rate at which an electrical force causes motion?

A

Power

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49
Q

What is the current in a circuit with 15 ohms of resistance that uses 135 watts of power?

A

3 A

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50
Q

What is the total power used by a 15-ohm resistor with 4 amps of current?

A

240 W

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51
Q

How much total energy is converted by a l-horsepower motor in 10 hours?

A

7.46 kWh

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52
Q

When Kirchhoff’s voltage law is used to assign polarities to the voltage drop across a resistor, which of the following references is used to indicate the end of the resistor that the current enters?

A

Negative

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53
Q

Which of the following terms applies to a circuit in which there is NO complete path for current?

A

Open

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54
Q

A circuit in which the resistance is almost zero ohms is referred to by which of the following terms?

A

Short

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55
Q

Maximum power is transferred from a source to a load when the value of the load resistance is of what value when compared to the source resistance?

A

Equal

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56
Q

When maximum power is transferred from a source to a load, what is the efficiency of power transfer?

A

50%

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57
Q

A circuit consists of three resistors connected in parallel. R1 = 30 ohms, R2 = 15 ohms, and R3 = 10 ohms. If the current through R2 = 4 amperes, what is the total source voltage?

A

60 V

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58
Q

What is the relationship of total current to the current through a component in (a)
a series circuit, and (b) a parallel circuit?

A

(a) Equals (b) divides

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59
Q

If a current has a negative polarity when Kirchhoff’s current law is applied, which of the following, statements is true of the current?

A

It is leaving a junction

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60
Q

Three equal resistors are connected in parallel and each resistor has an ohmic value of 300 ohms. What is the equivalent resistance of the circuit?

A

100Ω

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61
Q

Three resistors with ohmic values of 120 ohms, 60 ohms, and 40 ohms are connected in parallel. What is the equivalent resistance of the circuit?

A

20Ω

62
Q

Two resistors with ohmic values of 90 ohms and 45 ohms are connected in parallel. What is the equivalent resistance of the circuit?

A

30Ω

63
Q

Which of the following terms describes a single resistor that represents a complex circuit?

A

Equivalent resistor

64
Q

If an open occurs in a series portion of a circuit, what is the effect on (a) total resistance, and (b) total current?

A

(a) Becomes infinite

(b) Decreases to zero

65
Q

If an open occurs in a parallel branch of a circuit, what is the effect on
(a) total resistance, and (b) total current?

A

(a) Increases

(b) decreases

66
Q

If a short circuit occurs in a series portion of a circuit, what is the effect on
(a) total resistance, and (b) total current?

A

(a) Decreases

(b) increases

67
Q

If a short circuit occurs in a parallel branch of a circuit, what is the effect in
(a) total resistance, and (b) total current?

A

(a) Decreases

(b) increases

68
Q

If one branch of a parallel network shorts, what portion of the circuit current, if any, will flow through the remaining branches?

A

All

69
Q

Which of the following circuit quantities need NOT be known before designing a voltage divider?

A
  1. The current of the source
  2. The voltage of the source
  3. The current requirement of the load
  4. The voltage requirement of the load
70
Q

A single voltage divider provides both negative and positive voltages from a single source voltage through the use of a

A

ground between two of the dividing resistors

71
Q

If you discover a possible malfunction in an electric circuit, which of the following actions should be taken?

A

Report the malfunction to a qualified technician

72
Q

If a person has stopped breathing and there is NO detectable heartbeat, who should perform CPR?

A

Trained, qualified personnel only

73
Q

The basic unit of electrical current.

A

AMPERE

74
Q

The force that tends to make two objects approach each other. Attraction exists between two unlike magnetic poles (North and South) or between two unlike static charges (plus and minus).

A

ATTRACTION

75
Q

The current through a bleeder resistor. In a voltage divider, bleeder current is usually determined by the 10 percent rule of thumb.

A

BLEEDER CURRENT

76
Q

A resistor which is used to draw a fixed current.

A

BLEEDER RESISTOR

77
Q

An individual current path in a parallel circuit.

A

BRANCH

78
Q

A series-parallel circuit.

A

COMBINATION CIRCUIT

79
Q

The ability of a material to conduct or carry an electric current. It is the reciprocal of the resistance of the material, and is expressed in mhos or siemans.

A

CONDUCTANCE

80
Q

Ease with which a substance transmits electricity.

A

CONDUCTIVITY

81
Q

1) A material with a large number of free electrons. (2) A material which easily permits electric current to flow.

A

CONDUCTOR

82
Q

A measure of the quantity of electricity.

A

COULOMB

83
Q

Also called the law of electric charges or the law of electrostatic attraction.

A

COULOMB’S LAW—states that charged bodies attract or repel each other with a force that is directly proportional to the product of their individual charges and inversely proportional to the square of the distance between them.

84
Q

CPR

A

Cardio-Pulmonary Resuscitation.

85
Q

The area of a “slice” of an object. When applied to electrical conductors, it is usually expressed in circular mils.

A

CROSS-SECTIONAL AREA

86
Q

The flow of electrons past a reference point. The passage of electrons through a conductor. Measured in amperes.

A

CURRENT

87
Q

A short circuit having minimum resistance.

A

DEAD SHORT

88
Q

The space between and around charged bodies in which their influence is felt. Also called Electric Field of Force or an Electrostatic Field.

A

DIELECTRIC FIELD

89
Q

An electric current that flows in one direction only.

A

DIRECT CURRENT

90
Q

A theory of magnetism based upon the electron-spin principle. Spinning electrons have a magnetic field. If more electrons spin in one direction than another, the atom is magnetized.

A

DOMAIN THEORY

91
Q

The ratio of output power to input power, generally expressed as a percentage.

A

EFFICIENCY

92
Q

The flow of electrons.

A

ELECTRIC CURRENT

93
Q

Symbol Q, q. Electric energy stored on or in an object. The negative charge is caused by an excess of electrons; the positive charge is caused by a deficiency of electrons.

A

ELECTRICAL CHARGE

94
Q

An electrically excited magnet capable of exerting mechanical force, or of performing mechanical work.

A

ELECTROMAGNET

95
Q

The term describing the relationship between electricity and magnetism. Having both magnetic and electric properties.

A

ELECTROMAGNETIC

96
Q

The production of a voltage in a coil due to a change in the number of magnetic lines of force (flux linkages) passing through the coil.

A

ELECTROMAGNETIC INDUCTION

97
Q

Pertaining to electricity at rest, such as charges on an object (static electricity).

A

ELECTROSTATIC

98
Q

A substance, in chemistry, that cannot be divided into simpler substances by any means ordinarily available.

A

ELEMENT

99
Q

The force which causes electricity to flow between two points with different electrical charges or when there is a difference of potential between the two points. The unit of measurement in volts

A

EMF—(Electromotive Force)

100
Q

The ability or capacity to do work.

A

ENERGY

101
Q

A resistance that represents the total ohmic values of a circuit component or group of circuit components. Usually drawn as a single resistor when simplifying complex circuits.

A

EQUIVALENT RESISTANCE—(Req)

102
Q

A highly magnetic material, such as iron, cobalt, nickel, or alloys, make up these materials.

A

FERROMAGNETIC MATERIAL

103
Q

A term used to describe the total force exerted by an action-at-a-distance phenomenon such as gravity upon matter, electric charges acting upon electric charges, magnetic forces acting upon other magnets or magnetic materials.

A

FIELD OF FORCE

104
Q

A resistor having a definite resistance value that cannot be adjusted.

A

FIXED RESISTOR

105
Q

In electrical or electromagnetic devices, a general term used to designate collectively all the electric or magnetic lines of force in a region.

A

FLUX

106
Q

The number of magnetic lines of force passing through a given area.

A

FLUX DENSITY

107
Q

Zero potential with respect to the ground or earth.

A

GROUND POTENTIAL

108
Q

The English unit of power, equal to work done at the rate of 550 foot-pounds per second. Equal to 746 watts of electrical power.

A

HORSEPOWER

109
Q

An electrostatic charge produced on an object by the electric field that surrounds a nearby object.

A

INDUCED CHARGE

110
Q

Current due to the relative motion between a conductor and a magnetic field

A

INDUCED CURRENT

111
Q

The electromotive force induced in a conductor due to the relative motion between a conductor and a magnetic field.

A

INDUCED ELECTROMOTIVE FORCE

“induced voltage”

112
Q

The act or process of producing voltage by the relative motion of a magnetic field across a conductor.

A

INDUCTION

113
Q

An electrically charged atom or group of atoms.

A

ION—Negative ions have an excess of electrons; positive ions have a deficiency of electrons.

114
Q

(1) The algebraic sum of the currents flowing toward any point and the current flowing from that point in an electric network is zero. (2) The algebraic sum of the products of the current and resistance in each of the conductors in any closed path in a network is equal to the algebraic sum of the electromotive forces in the path.

A

KIRCHHOFF,S LAWS

115
Q

The space in which a magnetic force exists.

A

MAGNETIC FIELD

116
Q

MHO

A

Unit of conductance: the reciprocal of the ohm. Replaced by siemens.

117
Q

A prefix meaning one million

A

MEGA

118
Q

A prefix meaning one-millionth.

A

MICRO

119
Q

A prefix meaning one-thousandth.

A

MILLI

120
Q

The unit of electrical resistance. It is that value of electrical resistance through which a constant potential difference of 1 volt across the resistance will maintain a current flow of 1 ampere through the resistance.

A

OHM

121
Q

The current in an electric circuit is directly proportional to the electromotive force in the circuit. The most common form of the law is E = IR, where E is the electromotive force or voltage across the circuit, I is the current flowing in the circuit, and R is the resistance of the circuit.

A

OHM’S LAW

122
Q

Two or more electrical devices connected to the same pair of terminals so separate currents flow through each; electrons have more than one path to travel from the negative to the positive terminal.

A

PARALLEL CIRCUIT

123
Q

The measure of the ability of a material to act as a path for magnetic lines of force.

A

PERMEABILITY

124
Q

A prefix adopted by the National Bureau of Standards meaning 10-12.

A

PICO

125
Q

The effect of producing a voltage by placing a stress, either by compression, expansion, or twisting, on a crystal and, conversely, producing a stress in a crystal by applying a voltage to it.

A

PIEZOELECTRIC EFFECT

126
Q

The condition in an electrical circuit by which the direction of the flow of current can be determined. Usually applied to batteries and other direct voltage sources. (2) Two opposite charges, one positive and one negative. (3) A quality of having two opposite magnetic poles, one north and the other south.

A

POLARITY

127
Q

The effect of hydrogen surrounding the anode of a cell which increases the internal resistance of the cell.

A

POLARIZATION

128
Q

Energy due to the position of one body with respect to another body or to the relative parts of the same body.

A

POTENTIAL ENERGY

129
Q

A 3-terminal resistor with one or more sliding contacts, which functions as an adjustable voltage divider.

A

POTENTIOMETER

130
Q

The rate of doing work or the rate of expending energy.

A

POWER—The unit of electrical power is the watt

131
Q

A measure of the opposition that a material offers to magnetic lines of force.

A

RELUCTANCE

132
Q

The mechanical force tending to separate bodies having like electrical charges or like magnetic polarity.

A

REPULSION

133
Q

Magnetism remaining in a substance after removal of the magnetizing force.

A

RESIDUAL MAGNETISM

134
Q

(1) The property of a conductor which determines the amount of current that will flow as the result of the application of a given electromotive force. All conductors possess some resistance, but when a device is made especially for the purpose of limiting current flow, it is called a resistor. A resistance of 1 ohm will allow a current of 1 ampere to flow through it when a potential of 1 volt is applied. (2) The opposition which a device or material offers to the flow of current. The effect of resistance is to raise the temperature of the material or device carrying the current. (3) A circuit element designed to offer a predetermined resistance to current flow.

A

RESISTANCE

135
Q

The electrical component which offers resistance to the flow of current. It may be a coil of fine wire or a composition rod.

A

RESISTOR

136
Q

The ability of a material to retain its magnetism.

A

RETENTIVITY

137
Q

(1) A resistor whose value can be varied. (2) A variable resistor which is used for the purpose of adjusting the current in a circuit.

A

RHEOSTAT

138
Q

An arrangement where electrical devices are connected so that the total current must flow through all the devices; electrons have one path to travel from the negative terminal to the positive terminal.

A

SERIES CIRCUIT

139
Q

A low resistance connection between two points of different potential in a circuit, usually accidental and usually resulting in excessive current flow that may cause damage.

A

SHORT CIRCUIT

140
Q

The new and preferred term for mho.

A

SIEMANS

141
Q

Stationary electricity that is in the form of a charge. The accumulated electric charge on an object.

A

STATIC ELECTRICITY

142
Q

A wire-wound, fixed resistor having one or more additional terminals along its length, generally for voltage-divider applications.

A

TAPPED RESISTOR

143
Q

A junction of two dissimilar metals that produces a voltage when heated.

A

THERMOCOUPLE

144
Q

1) The maximum error or variation from the standard permissible in a measuring instrument. (2) A maximum electrical or mechanical variation from specifications which can be tolerated without impairing the operation of a device.

A

TOLERANCE

145
Q

.The measure of the extent to which an atom is able to combine directly with other atoms. It is believed to depend on the number and arrangement of the electrons in the outermost shell of the atom.

A

VALENCE

146
Q

A wire-wound or composition resistor, the value of which may be changed.

A

VARIABLE RESISTOR

147
Q

The term used to signify electrical pressure

A

VOLTAGE—Voltage is a force which causes current to flow through an electrical conductor. (2) The voltage of a circuit is the greatest effective difference of potential between any two conductors of the circuit

148
Q

The difference in voltage between two points. It is the result of the loss of electrical pressure as a current flows through a resistance.

A

VOLTAGE DROP

149
Q

The practical unit of electrical power. It is the amount of power used when one ampere of dc flows through a resistance of one ohm.

A

WATT

150
Q

A rating expressing the maximum power that a device can safely handle

A

WATTAGE RATING

151
Q

A theory of magnetism which assumes that all magnetic material is composed of many tiny magnets. A piece of magnetic material that is magnetized has all of the tiny magnets aligned so that the north pole of each magnet points in one direction.

A

WEBER’S THEORY

152
Q

The product of force and motion.

A

WORK

"CE" E6 REGULAR EXAM SEP 2014 (9 decks)

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