Quiz 10-14

If 0.8 A of current flow through a light bulb connected to a 120 V outlet, the power consumed is A. 96 W. B. 15 W. 12 W. 120 W.

A. 96 W.

When we say an appliance "uses up electricity," we really are saying that A. electron kinetic energy is changed into heat or other forms of energy. B. electrons are taken out of the circuit and put somewhere else. C. the main power supply voltage is lowered. D. electric charges are dissipated.

A. electron kinetic energy is changed into heat or other forms of energy.

As more lamps are put into a parallel circuit, the overall current in the power source A. increases. B. decreases. C. depends on the voltage. D. stays the same.

A. increases.

When two lamps are connected in parallel to a battery, the electrical resistance that the battery senses is A. less than the resistance of either lamp. B. equal to the resistance of either lamp. C. more than the resistance of either lamp. D. none of these

A. less than the resistance of either lamp.

Compared to a single lamp connected to a battery, two lamps connected in parallel to the same battery will carry A. more current. B. less current. C. the same current. D. 2 Amperes of current.

A. more current.

A 60-W light bulb and a 100-W light bulb are each rated at 120 V. Which light bulb has a larger resistance? A. the 60 W bulb. B. the 100 W bulb. C. It is impossible to tell. D. Both have the same resistance.

A. the 60 W bulb.

A coulomb of charge that passes through a 6-volt battery is given A. 6 Amperes B. 6 Joules C. 6 Coulombs D. 6 Watts.

B. 6 Joules

An Ampere is a unit of electrical A. pressure. B. current. C. resistance. D. charge

B. current.

When two lamps are connected in series to a battery, the electrical resistancethat the battery senses is A. equal to the resistance of either lamp. B. more than the resistance of either lamp. C. less than the resistance of either lamp. D. none of these.

B. more than the resistance of either lamp.

In a 110-volt circuit containing a lamp in series with the voltage source, A. 110 joules of energy are converted to heat and light in the circuit every second. B. 110 coulombs of charge flow through the lamp every second. C. 110 joules of energy are given up by each coulomb of charge making up the current in the circuit. D. 110 joules of energy are shared among all the coulombs in the circuit at any instant.

C. 110 joules of energy are given up by each coulomb of charge making up the current in the circuit.

The current through a 10-ohm resistor connected to a 120-V power supply is A. 10 A. B. 1 A. C. 12 A. D. 120 A.

C. 12 A.

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

C. decreases.

Compared to a single lamp connected to a battery, two identical lamps connected in series to the same battery will carry A. depends on the voltage. B. more current. C. less current. D. the same current.

C. less current.

The electric power of a lamp that carries 2 A at 120 V is A. 2 Watts. B. 20 Watts. C. 60 Watts. D. 240 Watts.

D. 240 Watts.

When a 10-V battery is connected to a resistor, the current in the resistor is 2 A. What is the resistor's value? A. 10 Ohms. B. 2 Ohms. C. 20 Ohms. D. 5 Ohms.

D. 5 Ohms.

Which statement is correct? A. Voltage flows through an open or a closed circuit. B. Current is the primary cause of voltage. C. Resistance flows though an open circuit. D. Charge flows in a closed circuit.

D. Charge flows in a closed circuit.

The source of electrons lighting an incandescent ac light bulb is A. the source voltage. B. the wire leading to the lamp. C. the power company. D. atoms in the light bulb filament.

D. atoms in the light bulb filament

A wire carrying current is normally charged A. negatively. B. positively. C. up. D. not at all.

D. not at all.

On some early automobiles both headlights went out when one bulb burned out. The headlights must have been connected in A. perpendicular. B. parallel C. in haste. D. series.

D. series.

There are electrons in the filament of the ac lamp in your bedroom. When you turn on the lamp and it glows, the glowing comes from A. different electrons; the ones that flow in the circuit to your lamp. B. protons and electrons. C. the positive charges that flow in the filament. D. the same electrons.

D. the same electrons.

100 Coulombs of electric charge flows through a small light bulb that is connected to a battery that has a voltage of 10 V. How much energy has been used up by the light bulb? a. 1,000 J b. 500 J c. 10 J d. 100 J

a. 1,000 J

The direction of an electric field is the direction of the force that the field would exert on a. a proton b. a molecule c. an electron d. a neutral test charge

a. a proton

Electric potential, measured in volts, is the ratio of electric energy to amount of electric a. charge b. resistance c. current d. field

a. charge

To say that an object is electrically polarized is to say a. its charges have been rearranged b. it's positively charged c. it's to some degree magnetic d. it's electrically charged

a. its charges have been rearranged

Two charged particles held close to each other are released. As they move, the force on each particle increases. Therefore, the particles must have a. opposite signs b. the same size c. the same signs d. the same mass

a. opposite signs

A positive ion has more a. protons than electrons b. protons than neutrons c. a larger nucleus d. electrons than protons

a. protons than electrons

Particle A has twice the charge of nearby particle B. Compared to the force on Particle A, the force on Particle B is a. the same b. twice as much c. four times as much d. half as much

a. the same

Two charges separated by one meter exert 1-N forces on each other. If the charges are pushed to 1/4 meterseparation, the force on each charge will be a. 2N b. 16N c. 4N d. 1N

b. 16N

The unit of electric charge, the coulomb, is the charge on a. one electron b. a specific large number of electrons c. one proton d. a neutron

b. a specific large number of electrons

Two protons attract each other gravitationally and repel each other electrically. By far the greater force is a. the gravitational attraction b. the electrical repulsion c. neither the forces are the same c. no answer text provided

b. the electrical repulsion

The electrical force on a 2-C charge is 60 N. What is the value of the electric field at the place where the charge is located? a. 240N/C b. 120 N/C c. 30 N/C d. 0 N/C

c. 30 N/C

A 2 Coulomb charge acquires a kinetic energy of 10,000 J as it moves between the plates of a capacitor. What is the voltage between the plates? a. 10,000 V b. 2,000 V c. 5,000 V d. 100 V

c. 5,000 V

An electron and a proton a. repel one another b. neither repel or attract one another c. attract one another d. annihilate one another

c. attract one another

You can touch a 100,000-volt Van de Graaff generator with little harm because although the voltage is high, the relatively small amount of charge means there is a relatively small amount of a. conduction b. electric field c. energy d. polarization

c. energy

A proton and an electron are placed in an electric field. Which undergoes the greater acceleration? a. neither accelerate b. the proton c. the electron d. both accelerate equally

c. the electron

If you use 10 J of work to push a coulomb of charge into an electric field, its voltage with respect to its starting position is a. more than 10V b. less than 10V c. none of the other choices are correct d. 10V

d. 10V

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. 4V b. 2V c. 0.5V d. 1V

d. 1V