Quiz 8: Static and Current Electricity
Physics & Astronomy
Q 1Q 1
Which of these scientists pioneered the study of electricity?
A)Isaac Newton
B)Galileo
C)Benjamin Franklin
D)all of the above
Free
Multiple Choice
C
Q 2Q 2
The nucleus of an atom is charged
A)positively.
B)negatively.
C)both of these
D)none of the above
Free
Multiple Choice
A
Q 3Q 3
The electric charge of all electrons
A)vary from atom to atom.
B)vary from ion to ion.
C)are identical.
Free
Multiple Choice
C
Q 4Q 4
Compared to the mass of a proton,the mass of an electron is
A)very much less.
B)identical.
C)greater.
Free
Multiple Choice
Free
Multiple Choice
Q 6Q 6
The pair of protons in the nucleus of a helium atom
A)attracts a pair of orbiting electrons.
B)repels orbiting electrons.
C)both of these
D)neither of these
Free
Multiple Choice
Q 7Q 7
The vast numbers of electrons in a coin don't fly off the surface because
A)mutual repulsion is incomplete.
B)they are attracted by an equal number of protons.
C)they are strongly bonded to their atoms.
D)all of the above
E)none of the above
Free
Multiple Choice
Q 8Q 8
When you remove electrons from a metal cup,the cup becomes
A)negatively charged.
B)positively charged.
C)ionized.
Free
Multiple Choice
Q 9Q 9
Which force binds atoms together to form molecules?
A)gravitational
B)nuclear
C)electric
D)centripetal
E)none of the above
Free
Multiple Choice
Q 10Q 10
The fundamental force underlying all chemical reactions is
A)gravitational.
B)nuclear.
C)centripetal.
D)electrical.
E)none of the above
Free
Multiple Choice
Q 11Q 11
Two positively-charged plastic straws near each other tend to
A)attract each other.
B)repel each other.
C)neutralize each other.
Free
Multiple Choice
Q 12Q 12
An electron and a proton
A)attract each other.
B)repel each other.
C)attract or repel depending on distance.
Free
Multiple Choice
Q 13Q 13
In an electrically neutral atom the number of protons in the nucleus is equal to the number of
A)electrons that surround the nucleus.
B)neutrons in the nucleus.
C)both of these
D)none of the above
Free
Multiple Choice
Q 14Q 14
Which of these does not have an electrical charge?
A)proton
B)electron
C)neutron
D)all of the above
E)none of the above
Free
Multiple Choice
Free
Multiple Choice
Q 16Q 16
A rubber rod rubbed with fur becomes
A)positively charged.
B)negatively charged.
C)both
D)neither
Free
Multiple Choice
Q 17Q 17
As you comb your hair,electrons are rubbed onto the comb,which becomes
A)negatively charged.
B)positively charged.
C)ionized.
Free
Multiple Choice
Q 18Q 18
When you scuff electrons from a carpet onto your shoes,you become
A)negatively charged.
B)positively charged.
C)polarized.
D)ionized.
E)neutralized.
Free
Multiple Choice
Q 19Q 19
If you strip electrons from an atom,the atom becomes a
A)positive ion.
B)negative ion.
C)different element.
Free
Multiple Choice
Q 20Q 20
To say that electric charge is conserved is to say that electric charge
A)occurs in an infinite variety of quantities.
B)is a whole-number multiple of the charge of one electron.
C)will interact with neighboring electric charges.
D)can neither be created nor destroyed.
Free
Multiple Choice
Q 21Q 21
To say that electric charge is conserved means that no case has ever been found where
A)the net charge on an object has changed.
B)the net amount of charge on an object has increased.
C)net charge has been created or destroyed.
D)none of the above
Free
Multiple Choice
Q 22Q 22
Charge carriers in a metal are electrons rather than protons because electrons are
A)negative.
B)smaller.
C)loosely bound.
D)all of the above
E)none of the above
Free
Multiple Choice
Q 23Q 23
A negatively charged rod is brought near a metal can that rests on a wooden table.You touch the opposite side of the can momentarily with your finger.The can then becomes
A)positively charged.
B)negatively charged.
C)uncharged.
Free
Multiple Choice
Q 24Q 24
The unit of electric charge,the coulomb,is the charge on
A)one electron.
B)one proton.
C)a specific large number of electrons.
Free
Multiple Choice
Q 25Q 25
A main difference between gravitational and electric forces is that electric forces
A)attract.
B)repel or attract.
C)obey the inverse-square law.
D)act over shorter distances.
E)are weaker.
Free
Multiple Choice
Q 26Q 26
A difference between electric and gravitational forces is that electric forces include
A)separation distance.
B)repulsive interactions.
C)the inverse-square law.
D)infinite range.
E)none of the above
Free
Multiple Choice
Q 27Q 27
The electric force between charges depends on the
A)magnitude of electric charges.
B)separation distance between electric charges.
C)both of these
D)none of the above
Free
Multiple Choice
Q 28Q 28
The electric force between charges is strongest when the charges are
A)close together.
B)far apart.
C)either of these
Free
Multiple Choice
Q 29Q 29
If electrons were positive and protons were negative,Coulomb's law would be written
A)the same.
B)somewhat differently.
C)very differently.
Free
Multiple Choice
Q 30Q 30
When the distance between two charges is halved,the electric force between the charges
A)quadruples.
B)doubles.
C)is half.
D)is reduced by one-quarter.
E)none of the above
Free
Multiple Choice
Q 31Q 31
Two charged particles 1 m apart exert a 1-N force on each other.If the magnitude of each charge is doubled,the force on each particle will be
A)1 N.
B)2 N.
C)4 N.
D)8 N.
E)none of the above
Free
Multiple Choice
Q 32Q 32
Two charged particles 1 m apart exert a 1-N force on each other.If the particles are instead 0.25-m apart,the force on each particle will be
A)1.0 N.
B)2.0 N.
C)4.0 N.
D)8.0 N.
E)16.0 N.
Free
Multiple Choice
Q 33Q 33
Two charged particles 1 m apart exert a 1-N force on each other.If the particles are instead 0.5 m apart,the force on each particle will be
A)1.0 N.
B)2.0 N.
C)4.0 N.
D)8.0 N.
E)16.0 N.
Free
Multiple Choice
Q 34Q 34
Two charged particles repel each other with a force F.If the charge of one particle is doubled and the distance between them is doubled,the force will be
A)F.
B)2 F.
C)F/2.
D)F/4.
E)none of the above
Free
Multiple Choice
Q 35Q 35
To say that an object is electrically polarized is to say
A)it is electrically charged.
B)its charges have been rearranged.
C)its internal electric field is zero.
D)it is only partially conducting.
E)it is to some degree magnetic.
Free
Multiple Choice
Q 36Q 36
An electrically polarized object normally has
A)a net charge of zero.
B)displaced charges.
C)both of these
D)none of the above
Free
Multiple Choice
Q 37Q 37
A balloon will stick to a wooden wall if the balloon is charged
A)negatively.
B)positively.
C)either of these
D)none of the above
Free
Multiple Choice
Q 38Q 38
A negatively-charged balloon touching a wooden wall
A)pulls positive charge on the wall surface toward it.
B)pushes negative charge in the wall away from it.
C)polarizes molecules in the wall.
D)all of the above
E)none of the above
Free
Multiple Choice
Q 39Q 39
A positive and a negative charge near each other are released.As they move,the force on each particle
A)increases.
B)decreases.
C)stays the same.
Free
Multiple Choice
Q 40Q 40
Two charged particles near each other are released.As they move,the force on each particle increases.Therefore,the particles have
A)the same sign.
B)the opposite sign.
C)not enough information
Free
Multiple Choice
Q 41Q 41
Two charged particles near each other are released.As the particles move,the velocity of each increases.Therefore,the particles have
A)the same sign.
B)the opposite sign.
C)not enough information
Free
Multiple Choice
Q 42Q 42
The direction of an electric field is defined as the direction of force on
A)a positively-charged particle.
B)a negatively-charged particle.
C)any charged particle.
Free
Multiple Choice
Q 43Q 43
Electric field lines about a point charge extend
A)outward when the charge is negative.
B)outward when the charge is positive.
C)in circles.
Free
Multiple Choice
Q 44Q 44
Every proton in the universe is surrounded by its own
A)electric field.
B)gravitational field.
C)both of these
D)none of the above
Free
Multiple Choice
Q 45Q 45
The electric field around an isolated electron has a certain strength at a 1-cm distance from the electron.The electric field strength 2 cm from the electron is
A)half as much.
B)the same.
C)twice as much.
D)four times as much.
E)none of the above
Free
Multiple Choice
Q 46Q 46
The electric field between oppositely-charged parallel plates is
A)uniform.
B)stronger at the ends.
C)composed of field lines curved in opposite directions.
D)none of the above
Free
Multiple Choice
Q 47Q 47
A proton and an electron placed in an electric field experience the same force.Which undergoes the greater acceleration?
A)electron
B)proton
C)both equally
D)none of the above
Free
Multiple Choice
Q 48Q 48
The electric field lines between a pair of equal and opposite charges are
A)directed from positive to negative.
B)more concentrated closer to the charges.
C)vectors,with patterns resulting from the inverse-square law.
D)all of the above
E)none of the above
Free
Multiple Choice
Q 49Q 49
Much of the charge on a conducting cube is
A)uniformly spread over its surface.
B)partly beneath the surface.
C)mutually repelled toward its corners.
D)none of the above
Free
Multiple Choice
Q 50Q 50
Electric charge distributes itself on conducting surfaces
A)with greater concentration on flat parts.
B)such that the electric field inside is zero.
C)both of the above
D)none of the above
Free
Multiple Choice
Q 51Q 51
Food cooked in a microwave oven depends on electrical
A)conduction.
B)charge polarization.
C)resistance changes.
D)field strength.
E)all of the above
Free
Multiple Choice
Q 52Q 52
Electric potential is measured in units of
A)volts.
B)joules.
C)amperes.
D)watts.
E)any or all of these
Free
Multiple Choice
Q 53Q 53
Electric potential is the ratio of electric energy to the amount of electric
A)current.
B)resistance.
C)charge.
D)voltage.
E)none of the above
Free
Multiple Choice
Q 54Q 54
If you do 10 J of work to push 1 coulomb of charge into an electric field,its voltage with respect to its starting position is
A)less than 10 V.
B)10 V.
C)more than 10 V.
D)none of the above
Free
Multiple Choice
Q 55Q 55
It takes 10 J of work to push a charge into an electric field.Relative to its starting position it has gained a potential energy of
A)less than 10 J.
B)10 J.
C)more than 10 J.
D)none of the above
Free
Multiple Choice
Q 56Q 56
It takes 10 J of work to push a charge initially at rest into an electric field.If the charge is then released,it flies back to its initial position with a kinetic energy of
A)zero.
B)5 J.
C)10 J.
D)more than 10 J.
E)need more information.
Free
Multiple Choice
Q 57Q 57
An electron is pushed into an electric field where it acquires a 1-V electrical potential.If two electrons are pushed the same distance into the same electric field,the electrical potential of the two electrons is
A)0.25 V.
B)0.5 V.
C)1 V.
D)2 V.
E)4 V.
Free
Multiple Choice
Q 58Q 58
When a battery does 24 J of work on 10 C of charge,the voltage it supplies is
A)2.4 V.
B)4.2 V.
C)24 V.
D)240 V.
E)none of the above
Free
Multiple Choice
Q 59Q 59
A charged balloon illustrates that something can have a great amount of
A)potential energy and a low voltage.
B)voltage and a small potential energy.
C)both voltage and potential energy.
D)none of the above
Free
Multiple Choice
Q 60Q 60
Normally a balloon charged to several thousand volts has a relatively small amount of
A)charge.
B)energy.
C)both of these
D)none of the above
Free
Multiple Choice
Q 61Q 61
Which is more dangerous,touching a faulty 120-V light fixture,or a Van de Graaff generator charged to 100,000 V?
A)light fixture
B)generator
C)both equally
Free
Multiple Choice
Q 62Q 62
The different outcomes in touching a faulty 120-V light fixture and a high-voltage Van de Graaff generator have to do with differences in
A)sustainability of charge flow.
B)duration of charge flow.
C)amount of energy transferred.
D)all of the above
E)none of the above
Free
Multiple Choice
Q 63Q 63
The photo on page 193 shows Lillian's hair standing out when her hand is on a charged Van de Graaff generator,which illustrates
A)strands of hair become charged and repel one another.
B)a high voltage is communicated to strands of hair.
C)strands of hair orient themselves in an electric field.
D)the effect of electrons and protons deposited on her hair.
Free
Multiple Choice
Q 64Q 64
Lillian safely touches a 100,000-volt Van de Graaff generator.Although the voltage is high,the relatively small amount of charge means a relatively small amount of
A)energy transfer.
B)electric field.
C)polarization.
D)conduction.
Free
Multiple Choice
Q 65Q 65
Voltage is most similar to
A)pressure.
B)current.
C)resistance.
D)all of the above
E)none of the above
Free
Multiple Choice
Free
Multiple Choice
Q 67Q 67
Just as water flows from high to low pressure,electric charge flows from
A)high to low voltage.
B)high charge concentration to low charge concentration.
C)high resistance to low resistance.
D)all of the above
E)none of the above
Free
Multiple Choice
Q 68Q 68
The flow of charge in a circuit depends on
A)adequate resistance.
B)a potential difference.
C)adequate chemical action.
D)all of the above
Free
Multiple Choice
Q 69Q 69
The purpose of a voltage source is to provide an electrical
A)energy sink.
B)field.
C)pressure.
Free
Multiple Choice
Q 70Q 70
A sustained electric current can be achieved with a
A)generator.
B)battery.
C)both
D)none of the above
Free
Multiple Choice
Q 71Q 71
A sustained flow of electric charge requires
A)a potential difference.
B)a resistance.
C)an electric field.
D)electric polarization.
Free
Multiple Choice
Q 72Q 72
A suitable electric pump in an electric circuit is a
A)chemical battery.
B)generator.
C)both of these
D)neither of these
Free
Multiple Choice
Q 73Q 73
The amount of energy given to each coulomb of charge flowing through a 12-V battery is
A)12 J.
B)12 A.
C)12 V.
D)all of the above
E)none of the above
Free
Multiple Choice
Q 74Q 74
Electrons flow in a wire when there is
A)an imbalance of charges in the wire.
B)a potential difference across its ends.
C)a difference in potential energy across its ends.
D)none of the above
Free
Multiple Choice
Q 75Q 75
Just as a sustained flow of water in a hydraulic circuit needs a pump,the flow of charge in an electric circuit needs
A)current.
B)voltage.
C)resistance.
Free
Multiple Choice
Q 76Q 76
When we think of electric potential difference,we are thinking about
A)current.
B)voltage.
C)resistance.
Free
Multiple Choice
Q 77Q 77
Electric charge will flow in an electric circuit when
A)electric resistance is low.
B)a potential difference exists.
C)the circuit is grounded.
D)electric devices in the circuit are not defective.
Free
Multiple Choice
Q 78Q 78
The flow of electrons in an electric circuit move by
A)bumping other electrons.
B)colliding with molecules.
C)interacting with an established electric field.
D)none of the above
Free
Multiple Choice
Q 79Q 79
The electric current in a copper wire is normally composed of
A)electrons.
B)protons.
C)ions.
D)all of the above
Free
Multiple Choice
Q 80Q 80
An ampere is a unit of electric
A)pressure.
B)current.
C)resistance.
D)all of the above
E)none of the above
Free
Multiple Choice
Q 81Q 81
The net electric charge on a current-carrying wire is normally
A)zero.
B)equal and opposite to the charge within the wire.
C)the voltage divided by the resistance.
Free
Multiple Choice
Q 82Q 82
A coulomb of charge passing through a 6-V battery acquires
A)6 joules.
B)6 amperes.
C)6 ohms.
D)6 watts.
E)6 newtons.
Free
Multiple Choice
Q 83Q 83
A coulomb of charge flowing in a bulb filament powered by a 6-volt battery is provided with
A)6 ohms.
B)6 amperes.
C)6 joules.
D)6 watts.
E)6 newtons.
Free
Multiple Choice
Q 84Q 84
The electric field in the wires of an ac circuit
A)changes via the inverse square law.
B)changes direction with time.
C)remains relatively constant.
D)is nonexistent.
E)none of the above
Free
Multiple Choice
Q 85Q 85
To say a circuit is dc is to say that current in the circuit
A)has a single direction.
B)alternates only slowly.
C)is parallel to the connecting wires.
Free
Multiple Choice
Q 86Q 86
Direct current is normally produced by a
A)battery.
B)generator.
C)both of these
D)neither of these
Free
Multiple Choice
Q 87Q 87
Alternating current is normally produced by a
A)battery.
B)generator.
C)both of these
D)neither of these
Free
Multiple Choice
Q 88Q 88
Current that is typically 60 hertz is
A)direct current.
B)alternating current.
C)either of these
D)neither of these
Free
Multiple Choice
Q 89Q 89
The source of electrons in an ordinary electric circuit is
A)a dry cell,wet cell,or battery.
B)usually a wall socket.
C)a generator at the power station.
D)the electric conductor itself.
E)none of the above
Free
Multiple Choice
Q 90Q 90
The source of electrons lighting an incandescent ac light bulb is
A)the power company.
B)the electric outlet.
C)atoms in the light-bulb filament.
D)the wire leading to the lamp.
E)the source voltage.
Free
Multiple Choice
Q 91Q 91
In a common dc circuit,electrons typically move at the speed of
A)a fraction of a centimeter per second.
B)a few meters per second.
C)sound.
D)light.
E)none of the above
Free
Multiple Choice
Q 92Q 92
The average speed of electrons flowing though the filament of a dc flashlight bulb is
A)about the same speed as sound in metals.
B)dependent on how quickly electrons bumps into one another.
C)the speed of light.
D)1000 cm/s.
E)a snail's pace of less than 1 cm/s.
Free
Multiple Choice
Q 93Q 93
The origin of the glow from the filament inside the ac incandescent lamp in your bedroom is
A)electrons resupplied by the wall outlet.
B)electrons already in the filament.
C)the positive charges that flow in the filament.
D)resistance in the filament.
Free
Multiple Choice
Q 94Q 94
The number of electrons delivered daily by power utilities to an average American home during a typical week is
A)zero.
B)110.
C)220.
D)billions of billions.
E)none of the above
Free
Multiple Choice
Q 95Q 95
When you purchase a water pipe in a hardware store,water is not included.When you purchase copper wire,electrons
A)must be supplied by you,just as water in a water pipe.
B)already exist in the wire.
C)may fall out,which is why wires are insulated.
D)none of the above
Free
Multiple Choice
Q 96Q 96
In a circuit powered by a battery it is correct to say that electrons flow
A)from the battery and into the circuit.
B)from the negative terminal to the positive terminal of the battery.
C)through both the battery and the devices making up the circuit.
D)none of the above
Free
Multiple Choice
Q 97Q 97
When we say an appliance "uses up" electricity,we are actually saying that
A)current disappears.
B)electric charges are dissipated.
C)the main power supply voltage is lowered.
D)electrons are taken out of the circuit and put somewhere else.
E)electrical energy changes to thermal energy.
Free
Multiple Choice
Q 98Q 98
The unit of resistance is named after
A)Isaac Newton.
B)Benjamin Franklin.
C)Georg Simon Ohm.
D)Micheal Faraday.
E)Charles Coulomb.
Free
Multiple Choice
Q 99Q 99
Electrical resistance is normally measured in
A)amperes.
B)volts.
C)newtons.
D)joules.
E)none of the above
Free
Multiple Choice
Q 100Q 100
Which of these,all of the same length,has the greater electrical resistance?
A)a copper rod
B)an iron rod
C)a rubber rod
D)all about the same
E)none of the above
Free
Multiple Choice
Q 101Q 101
Which of these,both of the same length,has the greater electrical resistance?
A)a thick copper wire
B)a thin copper wire
C)both about the same
D)need more information
Free
Multiple Choice
Q 102Q 102
A length of wire has resistance R.The same kind of wire twice as long has resistance
A)R/2.
B)R.
C)2R.
D)none of the above
Free
Multiple Choice
Q 103Q 103
Heat a copper wire and its electrical resistance
A)decreases.
B)remains unchanged.
C)increases.
Free
Multiple Choice
Q 104Q 104
More current will occur in a lamp when its filament is
A)cold.
B)hot.
C)either cold or hot.
Free
Multiple Choice
Q 105Q 105
The electric resistance of a superconductor is
A)zero.
B)infinite.
C)usually lower than ordinary resistors.
D)none of the above
Free
Multiple Choice
Q 106Q 106
Ohm's law tells us that the amount of current produced in a circuit is
A)directly proportional to voltage.
B)inversely proportional to resistance.
C)both of these
D)neither of these
Free
Multiple Choice
Q 107Q 107
Current in a conductor can be increased by
A)increasing the voltage across it.
B)reducing its resistance.
C)both of these
D)neither of these
Free
Multiple Choice
Q 108Q 108
When the voltage across a steady resistance is doubled,the current
A)is half.
B)remains the same.
C)is doubled.
D)is quadrupled.
Free
Multiple Choice
Q 109Q 109
When a steady voltage is across one-half as much resistance,the current
A)is half.
B)remains the same.
C)is doubled.
D)is quadrupled.
Free
Multiple Choice
Free
Multiple Choice
Q 111Q 111
The current through a 10-ohm resistor connected to a 120-V power supply is
A)1 A.
B)10 A.
C)12 A.
D)120 A.
E)none of the above
Free
Multiple Choice
Q 112Q 112
The voltage across a 10-ohm resistor carrying a current of 5 A is
A)2 V.
B)5 V.
C)10 V.
D)20 V.
E)more than 20 V.
Free
Multiple Choice
Q 113Q 113
The value of a resistor that carries 2 A when connected to 10 V is
A)2 ohms.
B)5 ohms.
C)10 ohms.
D)20 ohms.
E)more than 20 ohms.
Free
Multiple Choice
Q 114Q 114
When Eddie Electron experiences an electrical shock,the source of electrons composing the shock is
A)the ground beneath Eddie's feet.
B)Eddie's body.
C)the power plant.
D)whatever electric device being handled.
E)electric field in the air.
Free
Multiple Choice
Q 115Q 115
The damage of electrical shock is predominantly due to
A)excess current.
B)an absence of voltage.
C)reduced resistance.
D)none of the above
Free
Multiple Choice
Q 116Q 116
A bird can sit harmlessly on a high-voltage wire because
A)the wire is insulated.
B)no potential difference is across the birds feet.
C)current is inside,not outside,the wire.
D)the net charge on a current-carrying wire is zero.
E)all of the above
Free
Multiple Choice
Q 117Q 117
The purpose of the third prong on a common electric plug of an appliance is
A)to handle three-phase electricity.
B)to provide an alternate live wire.
C)to connect the appliance to zero ground potential.
D)a substitute for a safety fuse.
E)all of the above
Free
Multiple Choice
Q 118Q 118
An electrical device that is "grounded" has
A)no potential difference between it and the ground.
B)an infinite potential difference between it and the ground.
C)a firm connection to the ground.
D)low voltage.
Free
Multiple Choice
Q 119Q 119
If you plug a 110-V electric toaster into a 220-V outlet,current in the toaster will be about
A)half what is should be.
B)the same as if it were plugged into a 110-V outlet.
C)more than twice what it should be.
D)twice what it should be.
Free
Multiple Choice
Q 120Q 120
The current through two identical light bulbs connected in series is 0.25 A.The voltage across both bulbs is 110 V.The resistance of a single light bulb is
A)22 ohms.
B)44 ohms.
C)220 ohms.
D)440 ohms.
E)none of the above
Free
Multiple Choice
Q 121Q 121
Strictly speaking,it is correct to say that
A)charge flows through a circuit.
B)voltage flows through a circuit.
C)resistance is established across a circuit.
D)current causes voltage.
E)all of these
Free
Multiple Choice
Q 122Q 122
Strictly speaking,it is correct to say that voltage
A)flows through a circuit.
B)flows across a circuit.
C)is impressed across a device in a circuit.
D)all of these
Free
Multiple Choice
Q 123Q 123
Compared to the amount of current that flows from a battery and into a circuit,the amount of current that returns to the battery is
A)less.
B)the same.
C)greater.
D)dependent on the internal resistance of the battery.
Free
Multiple Choice
Q 124Q 124
Compared to a single lamp connected to a battery,two identical lamps connected in series to the same battery will draw
A)more current.
B)less current.
C)the same current.
Free
Multiple Choice
Q 125Q 125
Compared to a single lamp connected to a battery,two lamps connected in parallel to the same battery will draw
A)more current.
B)less current.
C)the same current.
Free
Multiple Choice
Q 126Q 126
Two lamps,a thick-filament one and a thin-filament one,are connected in series to a battery.The current is greater in the lamp with the
A)thick filament.
B)thin filament.
C)same in each
Free
Multiple Choice
Q 127Q 127
Two lamps,a thick-filament one and a thin-filament one,are connected in parallel to a battery.The current is greater in the lamp with the
A)thick filament.
B)thin filament.
C)same in each
Free
Multiple Choice
Q 128Q 128
Two light bulbs,a thick-filament one and a thin-filament one,are connected in parallel to a battery.The voltage is greater across the lamp with the
A)thick filament.
B)thin filament.
C)same for each
Free
Multiple Choice
Q 129Q 129
Two light bulbs,a thick-filament one and a thin-filament one,are connected in series to a battery.The voltage is greater across the lamp with the
A)thick filament.
B)thin filament.
C)same for both
Free
Multiple Choice
Q 130Q 130
When two bulbs are connected in series to a battery,the electric resistance that the battery senses is
A)greater than the resistance of either bulb.
B)less than the resistance of either bulb.
C)none of the above
Free
Multiple Choice
Q 131Q 131
When two light bulbs are connected in parallel to a battery,the electric resistance that the battery senses is
A)greater than the resistance of either bulb.
B)less than the resistance of either bulb.
C)none of the above
Free
Multiple Choice
Q 132Q 132
The safety fuse in an electric circuit is properly connected in
A)series with the circuit.
B)parallel to the circuit.
C)either of these
Free
Multiple Choice
Q 133Q 133
A pair of 1-ohm resistors connected in series has a combined resistance of
A)1 ohm.
B)2 ohms.
C)1/2 ohm.
D)none of the above
Free
Multiple Choice
Q 134Q 134
A pair of 1-ohm resistors connected in parallel has a combined resistance of
A)1 ohm.
B)2 ohms.
C)1/2 ohm.
D)none of the above
Free
Multiple Choice
Q 135Q 135
As more lamps are put into a series circuit,the overall current in the power source
A)increases.
B)decreases.
C)stays the same.
Free
Multiple Choice
Q 136Q 136
As more lamps are put into a parallel circuit,the overall current in the power source
A)increases.
B)decreases.
C)remains the same.
Free
Multiple Choice
Q 137Q 137
Compared to the resistance of two resistors connected in series,the same two resistors connected in parallel have
A)more resistance.
B)less resistance.
C)the same resistance.
Free
Multiple Choice
Q 138Q 138
More toll booths on a highway is analogous to a
A)series circuit.
B)parallel circuit.
C)complex combination of both of these
Free
Multiple Choice
Q 139Q 139
The headlights,radio,and defroster fan in an automobile are connected in
A)series.
B)parallel.
C)order of energy efficiency.
Free
Multiple Choice
Q 140Q 140
Compared to the amount of electric current in the filament of a lamp,the amount of current in the connecting wire is
A)definitely less.
B)often less.
C)actually more.
D)the same.
E)incredibly,all of the above
Free
Multiple Choice
Q 141Q 141
To achieve a high equivalent resistance for a pair of resistors,connect them in
A)series.
B)parallel.
C)either of these
Free
Multiple Choice
Q 142Q 142
To achieve a low equivalent resistance for a pair of resistors,connect them in
A)series.
B)parallel.
C)either of these
Free
Multiple Choice
Q 143Q 143
The equivalent resistance of any parallel branch in a circuit is
A)often less than the resistance of the lowest resistor.
B)always less than the resistance of the lowest resistor.
C)usually half the value of the lowest resistor.
D)none of the above
Free
Multiple Choice
Q 144Q 144
The equivalent resistance of resistors connected in series in a circuit is
A)often less than the resistance of the lowest resistor.
B)always less than the resistance of the lowest resistor.
C)usually half the value of the lowest resistor.
D)none of the above
Free
Multiple Choice
Q 145Q 145
The equivalent (combined)resistance of 1-ohm,2-ohm,and 3-ohm in series is about
A)1 ohm.
B)1.8 ohms.
C)6 ohms.
D)9 ohms.
Free
Multiple Choice
Q 146Q 146
The equivalent (combined)resistance of 1-ohm,2-ohm,and 3-ohm in parallel is about
A)0.06 ohm.
B)1 ohm.
C)1.8 ohms.
D)6 ohms.
E)9 ohms.
Free
Multiple Choice
Q 147Q 147
A pair of 1-ohm resistors connected in series is 2 ohms,and when connected in parallel is
A)1/2 ohm.
B)1 ohm.
C)also 2 ohms.
D)none of the above
Free
Multiple Choice
Q 148Q 148
A 4-ohm and 6-ohm resistor connected in parallel have an equivalent resistance of
A)2.4 ohms.
B)4 ohms.
C)5 ohms.
D)5.5 ohms.
E)10 ohms.
Free
Multiple Choice
Q 149Q 149
Three 10-ohm resistors take the shape of a triangle,one resistor in each leg.An ohm-meter across any two points of the triangle will show the equivalent resistance to be
A)1.4 ohms.
B)5 ohms.
C)6.7 ohms.
D)greater than 6.7 ohms.
Free
Multiple Choice
Q 150Q 150
Three resistors take the shape of a triangle,one resistor in each leg.Resistance in one leg is 4 ohms,in a second leg is 6 ohms,and third leg is 10 ohms.A measurement of resistance across the 10-ohm resistor will show the equivalent resistance to be
A)1.4 ohms.
B)5 ohms.
C)6.7 ohms.
D)greater than 6.7 ohms.
Free
Multiple Choice
Q 151Q 151
The unit of measurement for electric power is
A)joules per second.
B)watts.
C)both are equivalent
D)none of the above
Free
Multiple Choice
Q 152Q 152
The electric power of a lamp that carries 2 A at 120 V is
A)1/6 W.
B)2 W.
C)60 W.
D)20 W.
E)240 W.
Free
Multiple Choice
Q 153Q 153
The current in a 100-W bulb connected to a 120-V source is
A)0.5 A.
B)1.2 A.
C)12,000 A.
D)none of the above
Free
Multiple Choice
Q 154Q 154
What is the power rating of a device that draws 0.8 A when connected to 120 V?
A)12 W
B)15 W
C)60 W
D)96 W
E)120 W
Free
Multiple Choice
Q 155Q 155
The power dissipated in a 4-ohm resistor carrying 3 A is
A)7 W.
B)18 W.
C)36 W.
D)48 W.
E)not enough information
Free
Multiple Choice
Q 156Q 156
Which has the larger resistance,a 60-W or a 100-W incandescent lamp,both rated for 120-V operation?
A)60-W lamp
B)100-W lamp
C)both the same
Free
Multiple Choice
Q 157Q 157
Which draws more current,a 60-W or a 100-W incandescent lamp,both rated for 120-V operation?
A)60-W lamp
B)100-W lamp
C)both the same
Free
Multiple Choice
Q 158Q 158
A 100-W lamp glows brighter than a 25-W lamp.The electric resistance of the 100-W lamp is
A)less.
B)greater.
C)the same.
Free
Multiple Choice
Q 159Q 159
A compact fluorescent lamp gives more light output for
A)less power.
B)the same power.
C)greater resistance.
Free
Multiple Choice
Q 160Q 160
Which of these lamps is the longer lasting in a common circuit?
A)incandescent lamp
B)compact fluorescent lamp
C)light-emitting diode
D)all about the same
Free
Multiple Choice
Q 161Q 161
An electric heater is rated at 300 W when used in a 110-V circuit.The safety fuse in the circuit can accommodate 15 A of current.How many heaters can be safely operated in the circuit?
A)2
B)3
C)4
D)5
E)more than 5
Free
Multiple Choice
Q 162Q 162
A certain bulb with a resistance of 95 ohms and labeled "150 W" is designated for use in a
A)120-V circuit.
B)240-V circuit.
C)either
D)not enough information
Free
Multiple Choice
Q 163Q 163
For electric power that costs 10 cents per kilowatt hour,the cost of operating a 110-V heater that uses 20 A for 10 hours is
A)$0.22.
B)$0.55.
C)$2.20.
D)$5.50.
E)none of the above
Free
Multiple Choice
Q 164Q 164
A power line with a resistance of 2 ohms draws a current of 80 A.The power dissipated in the line is
A)40 W.
B)160 W.
C)320 W.
D)12,800 W.
E)none of the above
Free
Multiple Choice
Q 165Q 165
What is the resistance of a 120-W incandescent lamp connected to a 120-V power supply?
A)1 ohm
B)60 ohms
C)100 ohms
D)144 ohms
E)none of the above
Free
Multiple Choice
Q 166Q 166
A lamp rated 23W-120V means that it will deliver 23 W
A)when the voltage across it is 120 V.
B)whether or not it is connected to 120 V.
C)as long as the current is ac.
D)none of the above
Free
Multiple Choice
Q 167Q 167
The amount of current in an incandescent bulb rated 75W-120V is about
A)0.4 A.
B)0.6 A.
C)1.2 A.
D)more than 1.2 A.
Free
Multiple Choice
Free
Multiple Choice
Q 169Q 169
The amount of current in an LED bulb rated 10.5W-120V is
A)less than 1 A.
B)about 1 A.
C)more then 1 A.
Free
Multiple Choice
Q 170Q 170
To keep chickens warm in a shed on a cold night,it is best to use
A)an incandescent lamp.
B)a fluorescent lamp.
C)an LED lamp.
D)a CFL lamp.
Free
Multiple Choice
Q 171Q 171
What are the similarities and differences between Coulomb's law and Newton's law of gravitation?
Free
Essay
Q 172Q 172
Distinguish between ac and dc.When you plug a light bulb into a wall outlet,where is the source of electrons?
Free
Essay
Free
Essay
Q 174Q 174
What is the difference between an insulator and a conductor of electricity? Give examples of each.
Free
Essay
Q 175Q 175
What is electric resistance? What characteristics of a wire determine its resistance? How does resistance normally vary with temperature?
Free
Essay
Q 176Q 176
Which will do more damage,plugging a 120-V hair dryer into a 240-V circuit or plugging a 220-V hair dryer into a 120-V circuit? Explain.
Free
Essay
Q 177Q 177
Which has the thicker lamp filament,a 60-W incandescent bulb or a 100-W incandescent bulb?
Free
Essay
Q 178Q 178
A 60-W bulb and a 100-W bulb are connected in series in a circuit.Which draws more current? Which draws more current when connected in parallel?
Free
Essay