Quiz 8: Static and Current Electricity

Which of these scientists pioneered the study of electricity? A)Isaac Newton B)Galileo C)Benjamin Franklin D)all of the above

The nucleus of an atom is charged A)positively. B)negatively. C)both of these D)none of the above

The electric charge of all electrons A)vary from atom to atom. B)vary from ion to ion. C)are identical.

Compared to the mass of a proton,the mass of an electron is A)very much less. B)identical. C)greater.

Which of these has the greatest mass? A)proton B)electron C)both of these D)neither of these

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

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

When you remove electrons from a metal cup,the cup becomes A)negatively charged. B)positively charged. C)ionized.

Which force binds atoms together to form molecules? A)gravitational B)nuclear C)electric D)centripetal E)none of the above

The fundamental force underlying all chemical reactions is A)gravitational. B)nuclear. C)centripetal. D)electrical. E)none of the above

Two positively-charged plastic straws near each other tend to A)attract each other. B)repel each other. C)neutralize each other.

An electron and a proton A)attract each other. B)repel each other. C)attract or repel depending on distance.

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

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

A positive ion has a deficiency of A)electrons. B)neutrons. C)negative ions.

A rubber rod rubbed with fur becomes A)positively charged. B)negatively charged. C)both D)neither

As you comb your hair,electrons are rubbed onto the comb,which becomes A)negatively charged. B)positively charged. C)ionized.

When you scuff electrons from a carpet onto your shoes,you become A)negatively charged. B)positively charged. C)polarized. D)ionized. E)neutralized.

If you strip electrons from an atom,the atom becomes a A)positive ion. B)negative ion. C)different element.

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.

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

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

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.

The unit of electric charge,the coulomb,is the charge on A)one electron. B)one proton. C)a specific large number of electrons.

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.

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

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

The electric force between charges is strongest when the charges are A)close together. B)far apart. C)either of these

If electrons were positive and protons were negative,Coulomb's law would be written A)the same. B)somewhat differently. C)very differently.

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

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

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.

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.

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

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.

An electrically polarized object normally has A)a net charge of zero. B)displaced charges. C)both of these D)none of the above

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

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

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.

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

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

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.

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.

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

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

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

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

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

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

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

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

Electric potential is measured in units of A)volts. B)joules. C)amperes. D)watts. E)any or all of these

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

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

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

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.

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.

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

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

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

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

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

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.

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.

Voltage is most similar to A)pressure. B)current. C)resistance. D)all of the above E)none of the above

A term for electric pressure is A)current. B)voltage. C)electric resistance.

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

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

The purpose of a voltage source is to provide an electrical A)energy sink. B)field. C)pressure.

A sustained electric current can be achieved with a A)generator. B)battery. C)both D)none of the above

A sustained flow of electric charge requires A)a potential difference. B)a resistance. C)an electric field. D)electric polarization.

A suitable electric pump in an electric circuit is a A)chemical battery. B)generator. C)both of these D)neither of these

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

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

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.

When we think of electric potential difference,we are thinking about A)current. B)voltage. C)resistance.

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.

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

The electric current in a copper wire is normally composed of A)electrons. B)protons. C)ions. D)all of the above

An ampere is a unit of electric A)pressure. B)current. C)resistance. D)all of the above E)none of the above

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.

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.

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.

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

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.

Direct current is normally produced by a A)battery. B)generator. C)both of these D)neither of these

Alternating current is normally produced by a A)battery. B)generator. C)both of these D)neither of these

Current that is typically 60 hertz is A)direct current. B)alternating current. C)either of these D)neither of these

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

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.

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

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.

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.

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

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

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

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.

The unit of resistance is named after A)Isaac Newton. B)Benjamin Franklin. C)Georg Simon Ohm. D)Micheal Faraday. E)Charles Coulomb.

Electrical resistance is normally measured in A)amperes. B)volts. C)newtons. D)joules. E)none of the above

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

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

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

Heat a copper wire and its electrical resistance A)decreases. B)remains unchanged. C)increases.

More current will occur in a lamp when its filament is A)cold. B)hot. C)either cold or hot.

The electric resistance of a superconductor is A)zero. B)infinite. C)usually lower than ordinary resistors. D)none of the above

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

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

When the voltage across a steady resistance is doubled,the current A)is half. B)remains the same. C)is doubled. D)is quadrupled.

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.

Electrical resistance is greater for A)dry skin. B)wet skin. C)both the same

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

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.

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.

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.

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

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

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

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.

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.

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

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

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

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.

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.

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.

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

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

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

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

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

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

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

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

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

As more lamps are put into a series circuit,the overall current in the power source A)increases. B)decreases. C)stays the same.

As more lamps are put into a parallel circuit,the overall current in the power source A)increases. B)decreases. C)remains the same.

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.

More toll booths on a highway is analogous to a A)series circuit. B)parallel circuit. C)complex combination of both of these

The headlights,radio,and defroster fan in an automobile are connected in A)series. B)parallel. C)order of energy efficiency.

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

To achieve a high equivalent resistance for a pair of resistors,connect them in A)series. B)parallel. C)either of these

To achieve a low equivalent resistance for a pair of resistors,connect them in A)series. B)parallel. C)either of these

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

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

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.

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.

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

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.

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.

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.

The unit of measurement for electric power is A)joules per second. B)watts. C)both are equivalent D)none of the above

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.

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

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

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

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

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

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.

A compact fluorescent lamp gives more light output for A)less power. B)the same power. C)greater resistance.

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

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

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

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

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

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

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

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.

The amount of current in a CFL rated 23W-120V is about A)0.2A. B)5.2A. C)more than 5.2A.

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.

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.

What are the similarities and differences between Coulomb's law and Newton's law of gravitation?

Distinguish between ac and dc.When you plug a light bulb into a wall outlet,where is the source of electrons?

What is an electric current? How does it move in a wire? How fast do the electrons move?

What is the difference between an insulator and a conductor of electricity? Give examples of each.

What is electric resistance? What characteristics of a wire determine its resistance? How does resistance normally vary with temperature?

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.

Which has the thicker lamp filament,a 60-W incandescent bulb or a 100-W incandescent bulb?

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?