Frankfurt
A ____________________ resistor is a resistor whose values can be changed or varied over a range.
Variable
____ is a measure of the amount of power being used in a circuit.
Wattage
power in an electrical circuit is called a(n) ______.
Wattmeter
A circuit with little or no resistance in it is called ____.
a short circuit
The standard measure of inductance is the ____.
henry
A sine wave has a instantaneous voltage of 220 V after 67 degrees of rotation. What is the maximum value the wave form will reach?
239 v
A potentiometer is a variable resistor with ____ terminals.
3
Resistors that have a tolerance of plus/minus 20% have ____ color bands.
3
The maximum number of electrons that can be contained in any orbit is
32
The maximum number of electrons that can be contained in any orbit is ____.
32
The 40 amp breaker at 80% load will carry how many amps?
32 A
The most common popular name for variable resistors is ____.
Pot
The most common popular name for variable resistors is ____________________.
Pot
_____ direct current occurs when the voltage wave form turns on and off but never changes direction, which means it never reverses direction.
Pulsating
The AC voltage that will produce the same amount of power as a like value of DC voltage is called the ____ value.
RMS
_____ loads are loads that produce heat and have the current and the voltage in phase with each other.
Resistive
One function of ___ is to limit the flow of current through a circuit.
Resistors
One function of ____________________ is to limit the flow of current through a circuit.
Resistors
Producing electricity with heat is referred to as the ____ effect.
Seebeck
If a circuit has a voltage of 120 V and 20 amps, the resistance of the circuit is ____________________ ohms.
6
The most common frequency used in electrical generation in the United States and Canada is ____ hertz.
60
A diode permits current to flow in two direction(s).
False
The 3 principal parts of an atom are the proton ,neutron and nucleus.
False
The advantage of high voltage power lines is that it less voltage is required to produce the same amount of power?
False
The basic laws of physics states that likes attract and opposite's repel.
False
The force that exists between two objects that contain like electrical charges is called attraction.
False
A(n) _____ is the unit of resistance to current flow.
Ohm
The unit of measure for resistance is ___.
Ohms
____ can be produced in AC circuits only when both current and voltage are either positive or negative.
Watts True power
____ resistors can operate at higher temperatures than any other type of resistor.
Wire wound
The disadvantage of the metal film resistor is that ____.
it costs more than carbon resistors
The circuit has two 300 ohm resistors in parallel with each other which are in series with a 600 ohm and a 400 ohm resistor. Vs=10volts. What is the totoal current and resistance?
.009 amps and 1150 ohms
The circuit has a 200 ohm resistor in series with a 500 ohm and a 300 ohm resistor which are in parallel with each other. The voltage supply is 20 volts. What is the total current and resistance for the circuit?
.052 amps and 387.5 ohms
The circuit has a 50 ohm in series with two 100 ohm resistors which are in parallel with each other. The voltage supply is 10 Volts. What is the current and total resistance for the circuit?
.1 amps and 100 ohms
An ohmmeter should always be readjusted to _____ when the scale is changed.
0
If a DC voltmeter is connected to an AC circuit with an applied voltage of 240 V, the meter will read ____ volts.
0
If a clamp-on ammeter is clamped around more than one power line of a 240 V circuit, the meter will read ____ volts.
0
A coil has an inductance of 1.5 H and a wire resistance of 6 ohms. If the coil is connected to a battery of 3 V. how long will it take the current to reach its full Ohms law value?
1.25s
A series circuit has five resistors and the total voltage applied to the circuit is 120 volts. Four of the resistors have voltage drops of 35 volts, 25 volts, 30 volts, and 20 volts. The voltage drop of the fifth resistor is _________ volts.
10
When the color gold is used in the multiplier band, it means to divide the numeric value of the first two bands by ____.
10
When the color silver is used in the multiplier band, it means to divide the numeric value of the resistor by ____.
100
If a parallel circuit contains two resistors whose values are 30 ohms and 20 ohms, the total resistance of the circuit is ____ ohms.
12
A series circuit contains four resistors and the total resistance of the circuit is 420 ohms. Three of the resistors have values of 70 ohms, 80 ohms, and 150 ohms. The value of the fourth resistor is ___________ ohms.
120
In a combination circuit, a 100-ohm resistor is in series with two 50-ohm resistors that are in parallel with each other. The total resistance of the circuit is ________ ohms.
125
A rheostat is a variable resistor with ____ terminals.
2
Direct current is unidirectional.
True
____ are massless particles of pure energy.
Photons
A large amount of voltage that exists for a very short period of time is called a voltage _________.
spike
Metal oxide varistors are often found in ________ used to protect many home appliances such as televisions, stereos, and computers.
surge protectors
When using Fleming's generator rule, the thumb points in the direction of the ____.
thrust
Probably the greatest single advantage of alternating current is that it can be _____.
transformed
When using the color code to determine resistor values, the first ____________________ bands represent number values.
two
Any electrons located in the outer shell of an atom are known as ____ electrons.
valence
The circuit has 3 three hundred ohm resistors in parallel with each other and are in series with a 100 ohm resistor. The total circuit is 2 amps. What is the total voltage and resistance?
400 volts and 200 ohms
How much load will actually be on this circuit?
41.67
A series circuit has individual resistor values of 200 ohms, 150 ohms, 50 ohms, and 75 ohms. The total resistance of the circuit is _________ ohms.
475
Using Ohm's Law, determine the voltage of a circuit with 40 amps and 12 ohms. ____________________
480 volts
The exponential curve describes a rate of certain occurrences and is divided into ____ time constraints.
5
The value of 5 M-ohms is ____ ohms.
5,000,000
What next size breaker would you install?
60
The amount of electrical energy needed to produce one horsepower is ____ watts.
746
The circuit has a 50 volt supply with a 250 ohm resistor which is in series with two parallel 500 ohm resistors which are in series with a 250 ohm resistor. What is the total resistance and current?
750 ohms and 67 milliamps 750 ohms and .067 amps 75 ohms and .06 amps ****both a and b
A sine wave has a maximun voltage of 350 volts. At what angle of rotation will the voltage reach 53 volts?
8.71 degrees
Using Ohm's law, it would take ________ volts to push 4 amps of current through 20 ohms of resistance.
80
What does AC stand for
Alternating Current
current in an electrical circuit is called a(n) _______.
Ammeter
A _________________________ is defined as the amount of heat required to raise the temperature of one pound of water one degree Fahrenheit.
BTU- British Thermal Unit
____ cable is less affected by the skin effect.
Braided
When a large amount of AC current must be measured, current transformers known as _____, that have a standard secondary current rating of 5 A -- AC, are used.
CTs
There are three basic types of AC loads: resistive, inductive, and ______.
Capacitive
____ resistors are fixed resistors that are made by winding a piece of resistive wire around a ceramic core.
Carbon film Metal glaze Metal film ****None of the above
___ indicates the plus and minus limits of a resistor's ohmic value.
Color Code
___ law of electrostatic charges states that the force of electrostatic attraction or repulsion is directly proportional to the product of the two charges and inversely proportional to the square of the distance between them.
Columb's
______________ law of electrostatic charges states that the force of electrostatic attraction or repulsion is directly proportional to the product of the two charges and inversely proportional to the square of the distance between them.
Columb's
Before current can flow through a circuit, a _____ must exist.
Complete path
Before current can flow through a circuit, a _________________________ must exist.
Complete path
______ ohmmeters measure resistance by measuring the amount of voltage-drop across an unknown resistance.
Digital
The letter ____ is used to represent voltage in algebraic formulas.
E
When using Ohm's Law to determine voltage, the formula you would use is ____.
E = I ´ R
When using Ohm's law to determine the applied voltage of a parallel circuit in which the value of the circuit amperage and resistance are known, the formula used would be ____.
E = I ´ R
The ground point that is made by physically driving an object, such as a ground rod, into the ground is called a(n) ________ ground.
Earth
Digital meters are characterized by the use of a pointer and scales to indicate values.
False
____ can be produced when electrons move from one energy level to another.
Photons
If a circuit contains three resistors whose values are 50 ohms, 30 ohms, and 70 ohms, and the total resistance of the circuit is 150 ohms, the circuit is a parallel circuit.
False
In a AC circuit the magnetic field builds up and collapses only when the current is turned on and off.
False
Induction only occurs when a magnetic field collapses.
False
Is the 40 ampere breaker large enough to carry the load?
False
The purpose of a transformer is to decrease or increase current.
False
Thomas Edison's main competitor, Nikola Tesla, believed that alternating current was impractical for large-scale electrical transmission applications.
False
Thomas Edison's main compition, Nikola Tesla believed that alternating current was impractical for large scale electrical transmission applications?
False
When reading a digital meter, the symbol "mV" indicates megavolts.
False
____ resistors have only one ohmic value, which cannot be changed or altered.
Fixed
____ resistors are made from a compound of carbon graphite and a resin bonding material.
Graphite Fixed Resin ***None of the above***
Who won the super bowl in 2011?
Green Bay Packers
AC/DC ammeters use the ____ effect as their basic principle of operation.
Hall
All electricians should know that whenever current flows through a resistance, _____ is produced.
Heat
All electricians should know that whenever current flows through a resistance, ____________________ is produced
Heat
When using Ohm's Law to determine amperage, the formula you would use is ____.
I = E/R
When reading an ohmmeter scale, the value of resistance shown at the far left end of the scale is ________.
Infinity
____ law states that an induced voltage or current opposes the motion that causes it.
Lenz's
____ is the amount of power a circuit is supplying to an electrical device.
Load
A(n) ____________________ is the unit of resistance to current flow.
Ohm
Given the voltage and the resistance, the amount of current flow in a circuit can be determined by using _____.
Ohm's law
Given the voltage and the resistance, the amount of current flow in a circuit can be determined by using __________.
Ohm's law
In its simplest form, ____________________ states that it takes one volt to push one amp through one ohm.
Ohm's law
the resistance of an electrical circuit is called a(n) _______.
Ohmmeter
The unit of measure for resistance is ____________________.
Ohms
The formula to use to find power when voltage and current are known is ___________________.
P=E x I
A _____ wave reaches its peak positive voltage at 90 degrees, its maximum negative voltage at 270 degrees, and has a total of 360 electrical degrees.
Sine
____ waves are so named because the voltage at any point along the wave form is equal to the maximum, or peak, value times the sine of the angle of rotation.
Sine
____ states that current flows from the most positive point in a circuit to the most negative.
The conventional current flow theory
____ states that since electrons are negative particles, current flows from the most negative point in the circuit to the most positive.
The electron theory
____________________ indicates the plus and minus limits of a resistor's ohmic value.
Tolerance
A charge formed by a lack of electrons is said to be positive.
True
A low-impedance voltage tester has a very large current draw compared with other types of voltmeters and should never be used to test low-power circuits.
True
A point in a circuit when current reaches a junction point of resistors and splits is called a node.
True
Alternating current can be stepped up for the purpose of transmission and then be stepped down when it is to be used by a device.
True
Alternating current is bi directional.
True
Any number can be multiplied by 10 by moving the decimal point one place to the right, and any number can be divided by 10 by moving the decimal point one place to the left.
True
Basic electricity is the flow of electrons.
True
Fleming's left-hand generator rule can be used to determine the relationship of the motion of the conductor in the magnetic field to the direction of the induced current.
True
Matter is any substance that has mass and occupies space.
True
Most AC ammeters use a current transformer to change scale values instead of shunts, which can be used to increase range but cannot be used to decrease range.
True
Neutrons and proton's of an atom combine to form the Nucleus.
True
Resistors also have a power rating in watts that should not be exceeded or the resistor will be damaged.
True
The greatest advantage of AC current is that it can be transformed?
True
The principle of magnetic induction states that whenever a conductor cuts through magnetic lines of flux, a voltage is induced into the conductor.
True
The purpose of the magnetic core in a typical transformer is to concentrate and direct the magnetic field.
True
The turns ratio is the ratio of the number of turns of wire in the transformer primary winding to the number of turns of wire in the transformer secondary winding.
True
There are three factors that determine the amount of voltage that will be induced in a conductor. They are the number of turns of wire, the strength of the magnetic field, and the speed of the cutting action.
True
Voltage is the force or pressure that causes current to flow?
True
Who is buried in Grants tomb
Ulysses Grant
A ____ resistor is a resistor whose values can be changed or varied over a range.
Variable
____ is defined as electromotive force.
Voltage
____________________ is defined as electromotive force.
Voltage
voltage, but does not contain a meter movement or a digital display, is called a(n) _____.
Voltage Tester
____ are used to provide different voltages between certain points of a circuit.
Voltage dividers
voltage in a circuit is called a(n) __________.
Voltmeter
____ push current through a wire but cannot flow through the wire.
Volts
Carbon resistors will change their value because of ____.
age & overheating
A coil wound on a nonmagnetic core material such as wood or plastic is referred to as a(n) ____ inductor.
air core
Which of the following is an example of a good conductor of electricity?
aluminum
The ____, unlike the voltmeter, is a very low-impedance device.
ammeter
A(n) ____ is a low-resistance device used to conduct most of the circuit current away from the meter movement.
ammeter shunt
In a series circuit, the ____ is the same at any point in the circuit.
amperage
The ____ is a measurement of the amount of electricity that is flowing through a circuit.
ampere
In a series circuit, the sum of the voltage drops equals the ____________.
applied voltage
The basic building block of the universe is the.
atom
Digital meters that do not contain a range setting control are known as ____ meters.
autoranging
The ____ value must be found when a sine wave AC voltage is changed into direct current.
average
A basic law of physics states that a spinning object will pull away from its center point and that the faster it spins, the greater the ____ force becomes.
centrifugal
A point used as a common connection point for other parts of a circuit, but is not actually driven into the ground is called a(n) ________ ground.
chassis
The value of a resistor can often be determined by use of the ____________________.
color code
A ____ is generally made from material that contains one or two valence electrons.
conductor
Electrical ____ is the flow of electrons.
current
The advantage of high-voltage transmission is that less ______ is required to produce the same amount of power.
current
The total _______ flow in a parallel circuit is equal to the sum of the currents through all of the branches of the circuit.
current
When using Fleming's generator rule, the center finger shows the direction of the ____.
current induced into the armature
Each completed wave form of a sine wave is called a(n) ____.
cycle
A device used to prevent induced voltage spikes when the current flow through an inductor is stopped is the _______.
diode
The Greeks called amber ____, because of its ability to attract lightweight materials when rubbed with different materials.
elektron
A(n) ____ is a substance that cannot be chemically divided into a simpler substance.
element
When using Fleming's generator rule, the forefinger points in the direction of the ____.
field
The input impedance used to limit the flow of current through digital meters is accomplished by using ____.
field effect transistors
Resistors that have a tolerance of plus/minus 1%, as well as some military resistors, contain ____________________ bands of color.
five
A ____ is the amount of force required to raise a one-pound weight one foot.
foot-pound
When using the color code to determine the value of a resistor, the ____________________ band is the tolerance band, when the tolerance of the resistor is 5% or 10%.
fourth
In a sine wave, the number of complete cycles that occur in one second is called a ____.
frequency
The skin effect is proportional to the ____. As the ____ increases, the skin effect increases.
frequency
A ____-wave rectifier is one that changes both the positive half and the negative half of the AC wave form into DC.
full
A circuit where a path other than the one intended is established to ground is said to be ____.
grounded
The ____ conductor provides the return path and completes the circuit back to the power source.
grounded & neutral
A conductor connected to the case of an appliance to provide a low-resistance path to ground is called a(n) ____ conductor.
grounding
Electrical current will flow through the ____ conductor only when a circuit fault develops.
grounding
The ____ conductor is used to help prevent a shock hazard in the event that the hot conductor comes in contact with the case or frame of an appliance.
grounding
A coil has an inductance of one ____ when a current change of one ampere per second results in an induced voltage of one volt.
henry
Frequency is measured in _______.
hertz
Iron core inductors cannot be used for _______-frequency applications because of eddy current loss and hysteresis loss in the core material.
high
The polarity of the ____ voltage is determined by the polarity of the magnetic field in relation to the direction of movement.
induced
An exponential curve shows the rate at which current increases or decreases in a(n) ____.
inductor
Rubber, wood, plastic, and glass are good examples of ____ materials.
insulator
A coil wound on a core made of magnetic material such as silicon steel or soft iron is referred to as a(n) ____ inductor.
iron core
While inductance is proportional to the number of turns of wire, the type of core material used, and the cross-sectional area of the core, it is inversely proportional to the core ____.
length
A ____ wave is one in which the voltage rises at a constant rate with respect to time.
linear
In an electrical circuit, the ____ offers resistance to the circuit and limits the amount of current that can flow.
load
In the early days of electric power generation, Thomas Edison proposed powering the country with ____.
low-voltage direct current
One of the basic laws of electricity is that whenever current flows through a conductor, a ______ is created around the conductor.
magnetic field
The most common method of producing electricity is ____
magnetism
The most common method of producing electricity is ____.
magnetism
A device that can be used for voltage spike suppression in either AC or DC circuits is the ________ varistor.
metal oxide
When using the color code to determine resistor values, the third band is called the ____________________ band.
multiplier
When working with electrical equipment that requires sensitive adjustments, ____ resistors are usually used.
multiturn variable
A ____ charge is formed by an excess of electrons.
negative
A(n) ____ is the amount of resistance that allows one ampere of current to flow when the applied voltage is one volt.
ohm
A(n) ____ must never be connected to a circuit when the power is turned on.
ohmmeter
The ____ is used to measure resistance.
ohmmeter
The ____ must provide its own source of power.
ohmmeter
A ____ circuit contains elements of both series and parallel circuits.
open parallel series *none of the above
Square waves are generally produced by electronic devices called ____.
oscillators
A ____ circuit has more than one path for current flow.
parallel
A voltmeter is designed to be connected in ____ with the circuit to be measured.
parallel
In a ____ circuit, the total current is the sum of the current through all of the circuit paths.
parallel
In a ____ circuit, the voltage across any circuit branch is the same as the total voltage.
parallel
A section of a combination circuit composed of parallel resistors is called a ____.
parallel block
The ____ is measured from zero to the highest value obtained in either the positive or negative direction.
peak
The ____ value is measured from the maximum value in the positive direction to the maximum value in the negative direction.
peak-to-peak
Producing electricity from light involves the use of particles called ____.
photons
____ can be produced when electrons move from one energy level to another.
photons
The production of electricity by pressure involves the striking, bending, or twisting of certain crystals that is referred to as the ____ effect.
piezoelectric
In a series circuit, the total power used in a circuit is equal to the sum of the ____ used by all the parts of the circuit.
power
In a series circuit, the total power used in a circuit is equal to the sum of the ________ used by all the parts of the circuit.
power
When a toroid current transformer is used to measure AC current, the main power line acts as the ____ and is considered to be one turn.
primary winding
The average voltage is ____ the peak, or maximum, value of the wave form and to the length of time it is on as compared to the length of time it is off.
proportional to
The pulses of pulsating direct current are often referred to as ____.
proportional to
The atomic number of an element is the same as the number of ____ in the nucleus.
protons
The number of ____ in the nucleus determine what kind of element an atom is.
protons
In a parallel circuit, the total resistance is equal to the ____.
reciprocal of the sum of the reciprocals of the branch resistances product of the resistors divided by the sum of the resistors when the circuit has two resistors value of one resistor divided by the number of resistors when the circuit contains two or more resistors of the same value ****all of the above
A ______ is used to change alternating current into direct current.
rectifier
When the selector switch of a meter is turned to a new scale, steps of ____ are inserted in the circuit to increase the range or are removed from the circuit to decrease the range.
resistance
The definition of _____ is that the total resistance of a circuit can be found by adding the values of all the resistors in that circuit.
resistance adds
The definition of _____________ is that the total resistance of a circuit can be found by adding the values of all the resistors in that circuit.
resistance adds
In DC circuits, there is only one basic type of load, which is ____.
resistive
The pulses of pulsating direct current are often referred to as ____.
ripple
A ____ circuit has only one path for current flow.
series
A _______ circuit is a circuit that has only one path for the current to flow.
series
An ammeter is used to measure current and must be connected in ____ with the load.
series
In a ____ circuit, the current is the same at any point in the circuit.
series
In a ____ circuit, the sum of the voltage drops of the individual resistors must equal the applied voltage.
series
In a ____ circuit, the total resistance is the sum of the individual resistors.
series
A ____ circuit is a circuit with very little or no resistance.
short
____ is the best natural conductor of electricity.
silver
The ____ wave is produced by all rotating machines.
sine
The most common of all AC waves is the ____________________ wave.
sine
A potentiometer is a variable resistor used to provide a variable ____.
voltage
In a series circuit, the sum of all the voltage drops across all the resistors must be equal to the ________ applied to the circuit.
voltage
The induced _______ is proportional to the rate of change of current.
voltage
____ is the force that pushes the electrons through a resistance.
voltage
___________ is the force that pushes the electrons through a resistance.
voltage
Peak-to-peak, peak, RMS, and average are measurements of ____ associated with sine waves.
voltage and amperage
A principal function of resistors is to produce a ____, which is used to create the different ranges in multirange voltmeters.
voltage divider
_______ can be determined by observing the direction of current flow through the circuit.
voltage polarity
Electrical energy must be changed or converted into some other form of energy before there can be ____.
watts
______ is a measurement of electrical power.
watts
In magnetic measurement, 100,000,000 lines of magnetic flux are equal to one ____.
weber
Which of the following would be considered a good electrical insulator?
wood