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Physic
Q:
The electric field established by a generator in an ac circuit
A) increases via the inverse-square law.
B) changes magnitude and direction with time.
C) acts in one direction.
D) is non-existent.
E) none of the above
Q:
The electric field established by a battery in a dc circuit
A) increases via the inverse-square law.
B) changes magnitude and direction with time.
C) acts in one direction.
D) is non-existent.
E) none of the above
Q:
The drift speed of electrons that compose current in a flashlight is about
A) the speed of sound waves in metal.
B) the speed of light.
C) 1000 cm/s.
D) less than 1 cm/s.
E) any of the above under different conditions.
Q:
Although electrons in metal move in haphazard directions at many times the speed of sound, the drift speed of electrons that compose electric current is
A) a fraction of a centimeter per second.
B) many centimeters per second.
C) the speed of a sound wave.
D) the speed of light.
E) none of the above
Q:
Electrons flow in an electrical circuit by
A) being bumped by other electrons.
B) colliding with molecules.
C) interacting with an established electric field.
D) none of the above
Q:
The cause of electrical shock is predominantly
A) excess current.
B) excess voltage.
C) reduced resistance.
D) none of the above
Q:
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.
Q:
The number of electrons delivered daily to an average American home by an average power utility in the early 21st century was
A) zero.
B) 110.
C) 220.
D) billions of billions.
E) none of the above
Q:
Electrons that are energized to glow in the filament of a common ac lamp are
A) supplied by a wall outlet.
B) supplied by a wall outlet, which in turn are supplied by your power company.
C) electrons already in the filament.
D) none of the above
Q:
The source of energy that illuminates a lamp in your home is
A) the power company.
B) the electrical outlet.
C) atoms in the bulb filament.
D) the wire leads to the lamp.
E) the source voltage.
Q:
The source of electrons that illuminate a common lamp in your home is
A) the power company.
B) the electrical outlet.
C) atoms in the lamp filament.
D) the wires leading to the lamp.
E) the source voltage.
Q:
The source of electrons in a simple electric circuit is
A) the voltage source.
B) energy stored in the voltage source.
C) energy released by the voltage source.
D) the electrical circuit itself.
E) none of the above
Q:
For electric current in the home, your power company supplies
A) energy.
B) electrons.
C) both of these
D) neither of these
Q:
An electric diode is useful for
A) storing electrical energy.
B) boosting voltage.
C) limiting current.
D) voltage modification.
E) changing ac to dc.
Q:
A capacitor is useful in
A) boosting the energy output of a circuit.
B) increasing the current in a resistor.
C) smoothing pulsed current.
D) changing dc to ac in a circuit.
E) increasing or decreasing voltage.
Q:
Current that is typically 60 hertz is
A) direct current.
B) alternating current.
C) either of these
D) neither of these
Q:
Alternating current is normally produced by a
A) battery.
B) generator.
C) both of these
D) neither of these
Q:
Direct current is normally produced by a
A) battery.
B) generator.
C) both of these
D) neither of these
Q:
The current in 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
Q:
If an electric toaster rated at 110 V is accidently plugged into a 220-V outlet, the current drawn by the toaster will be
A) half its normal value.
B) the same as its normal value.
C) twice its normal value.
D) none of the above
Q:
Two lamps with different filament thicknesses, and therefore different resistances, are connected in series. Greater current is in the lamp with the
A) thick filament.
B) thin filament.
C) same in each
Q:
The resistance of a filament that carries 2 A when a 10-V potential difference across it is
A) 2 ohms.
B) 5 ohms.
C) 10 ohms.
D) 20 ohms.
E) more than 20 ohms.
Q:
The voltage across a 10-ohm resistor carrying 5 A is
A) 5 V.
B) 10 V.
C) 15 V.
D) 20 V.
E) more than 20 V.
Q:
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
Q:
Electric resistance in our skin is lowered when our skin is
A) moist.
B) dry.
C) none of the above
Q:
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
Q:
When you turn on a lamp, the initial current in its filament is greater at first, rather than a moment later, which indicates
A) something is faulty.
B) a time delay for current attaining its average speed.
C) increased temperature means increased resistance.
D) nothing of interest
Q:
Two light bulbs are connected to a battery, one at a time. The bulb that draws more current has the
A) lower resistance, and is brightest.
B) lower resistance, but is dimmer.
C) higher resistance, and is brightest.
D) higher resistance, but is dimmer.
E) none of the above
Q:
If you stretch a copper wire so that it is thinner, the resistance between its ends
A) decreases.
B) remains unchanged.
C) increases.
Q:
Heat a copper wire and its electric resistance
A) decreases.
B) remains unchanged.
C) increases.
Q:
If two copper wires of the same length have different thickness, then the thicker wire has
A) more resistance.
B) less resistance.
C) both the same
Q:
The current produced by voltage in a circuit is impeded by
A) electric barriers.
B) closed switches.
C) electric resistance.
D) none of the above
Q:
The unit of electrical resistance is the
A) volt.
B) ampere.
C) ohm.
D) none of the above
Q:
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.
Q:
It is correct to say that in electric circuits
A) charge flows through a circuit.
B) flowing charge is current.
C) voltage is applied across a circuit.
D) voltage is the ratio of energy per charge.
E) all of the above
Q:
Which statement is correct?
A) charge flows in a circuit
B) voltage flows in a circuit
C) resistance flows in a circuit
D) all of the above
Q:
A suitable electric pump in an electric circuit is a
A) chemical battery.
B) generator.
C) both of these
D) neither of these
Q:
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
Q:
Voltage is most similar to
A) pressure.
B) current.
C) resistance.
D) all of the above
E) none of the above
Q:
An ampere is a unit of electric
A) current.
B) voltage.
C) resistance.
Q:
To think of electric potential difference we are thinking about
A) current.
B) voltage.
C) resistance.
Q:
Just as a sustained flow of water in a hydraulic circuit needs a pump, in electric circuits the flow of charge needs
A) current.
B) voltage.
C) resistance.
Q:
Just as in hydraulic circuits there is water pressure, in electric circuits there is
A) current.
B) voltage.
C) resistance.
Q:
Just as water flows from a region of high pressure to a region of low pressure, electric charge flows from a region of
A) high electric pressure to a region of low electric pressure.
B) high potential energy to a region of low potential energy.
C) deep to shallow regions.
D) all of the above
Q:
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.
Q:
The electric field inside the dome of a Van de Graaff generator depends on the
A) amount of external charge.
B) volume of the dome.
C) amount of charge and volume of the dome.
D) none of the above
Q:
Although the energy per coulomb of a high-voltage party balloon is high, the energy transfer that occurs if you touch it is low due to
A) the relatively small amount of charge.
B) rubber being a poor conductor.
C) the small electric potential.
D) all of the above
Q:
Normally a small party balloon charged to several thousand volts will have a relatively small amount of
A) charge.
B) energy.
C) both of these
D) neither of these
Q:
Assume that 10 J of work pushes a charge initially at rest into an electric field. If the charge is then released, it flies back to its starting position with a kinetic energy of
A) zero.
B) 5 J.
C) 10 J.
D) more than 10 J.
E) need more information.
Q:
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.
Q:
If 10 J of work is used in pushing 1 C of charge into an electric field, its electric potential relative to its starting position is
A) less than 10 V.
B) 10 V.
C) more then 10 V.
D) none of the above
Q:
The net charge on a charged capacitor depends on
A) the area of the capacitor plates.
B) the distance between the capacitor plates.
C) the medium between the capacitor plates.
D) all of the above
E) none of the above
Q:
Electric potential, measured in volts, is the ratio of electric energy to the amount of electric
A) current.
B) resistance.
C) charge.
D) voltage.
E) none of the above
Q:
Imagine a single charge q placed on one corner of a square, and that the electric field at the center of the square is F/q. If additional equal charges are placed on the other three corners, the electric field at the center of the square due to these four equal charges is
A) F/q.
B) 4F/q.
C) F/(2q).
D) F/(4q).
E) none of the above
Q:
Imagine a single charge q placed at one corner of a square, and that the electric field at the center of the square is F/q. If two other equal charges are placed at the adjacent corners of the square (leaving the opposite corner "blank"), the electric field at the center of the square is
A) F/q.
B) 4F/q.
C) F/(2q).
D) F/(4q).
E) none of the above
Q:
The operation of a microwave oven makes use of
A) the polar nature of water molecules.
B) flip flopping of polarized molecules.
C) an oscillating electric field.
D) all of the above
E) none of the above
Q:
A proton and an electron are placed in an electric field. Which undergoes the greater acceleration?
A) electron
B) proton
C) both accelerate equally.
D) none of the above
Q:
The electric field inside an uncharged metal ball is zero. If the ball is negatively charged, the electric field inside the ball is then
A) less than zero.
B) zero.
C) greater than zero.
Q:
During a lightning strike you don't want to be inside a building framed with
A) steel.
B) iron.
C) aluminum.
D) wood.
Q:
The electric field around an isolated electron has a certain strength 1 cm 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
Q:
Between a pair of equal and opposite charges, field lines are
A) directed from positive to negative.
B) more concentrated closer to the charges.
C) vectors, with patterns that stem from the inverse-square law.
D) all of the above
E) none of the above
Q:
The electric field between oppositely-charged parallel plates is
A) uniform.
B) stronger at the ends.
C) composed of field lines in opposite directions.
D) none of the above
Q:
The direction of an electric field is the direction of the force exerted on
A) a neutral test charge.
B) an electron.
C) an atom.
D) a proton.
E) a molecule.
Q:
Every isolated proton in the universe is surrounded by its own
A) electric field.
B) gravitational field.
C) both of these
D) neither of these
Q:
A reason for electric shielding inside a conductor is that any free electrons inside would
A) not obey the inverse-square law.
B) cancel one another.
C) be set in motion until equilibrium is established, on the outside.
D) all of the above
E) none of the above
Q:
Electric shielding within a conductor is a consequence of
A) the balancing of opposing forces.
B) both the attraction and repelling nature of electricity.
C) cancellation of electric field lines.
D) all of the above
E) none of the above
Q:
Electric charge distributes itself on conducting surfaces
A) with greater concentration on more curved parts.
B) such that the electric field inside is zero.
C) both of the above
D) none of the above
Q:
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
Q:
The electrical force on a 2-C charge is 60 N. The electric field where the charge is located is
A) 20 N/C.
B) 30 N/C.
C) 60 N/C.
D) 120 N/C.
E) 240 N/C.
Q:
When a car is struck by lightning, the resulting electric field inside the car is
A) normally huge, but for a brief time.
B) small enough to be safe for a passenger inside.
C) zero.
Q:
An uncharged pith ball is suspended by a nylon fiber. When a positively-charged rubber rod is brought nearby, the pith ball
A) moves toward the rod.
B) is unaffected.
C) moves away from the rod.
D) none of the above
Q:
An uncharged pith ball is suspended by a nylon fiber. When a negatively-charged rubber rod is brought near the pith ball, without touching, the ball
A) becomes charged by induction.
B) becomes polarized.
C) is repelled by the rod.
D) is unaffected.
E) none of the above
Q:
Before a thunder storm, clouds in the sky likely become
A) conducting.
B) polarized.
C) grounded.
D) a field-free region.
Q:
A balloon will stick to a wooden wall if the balloon is charged
A) negatively.
B) positively.
C) either of these
D) neither of these
Q:
A common naturally-polarized bit of matter is
A) an electron.
B) a hydrogen atom
C) a water molecule.
D) all of the above
E) none of the above
Q:
If you rub an inflated balloon against your hair and place the balloon against the wall it will stick to the wall, illustrating
A) Coulomb's law.
B) conduction and insulation.
C) charge polarization.
D) voltage.
Q:
To say that an object becomes electrically polarized means that
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) none of the above
Q:
Two charged particles held close to each other are released. As they move, their speeds increase. Therefore, their charges have
A) the same sign.
B) opposite signs.
C) either of these
D) need more information
Q:
Two charged particles held a certain distance apart are released. As they move, the force on each particle increases. Therefore, their charges have
A) the same sign.
B) opposite signs.
C) the same mass.
D) the same size.
E) need more information
Q:
Two charged particles held a certain distance apart are released. As they move, the acceleration of each decreases. Therefore, their charges have
A) the same sign.
B) opposite signs.
C) need more information