Transcript e. none of the above

If you plug an electric toaster
rated at 110 V into a 220-V
outlet, current in the toaster will
be
a. twice what it should be.
b. the same as if it were
plugged into 110 V.
c. half what it should be.
d. more than twice what it
should be.
e. none of the above
If you plug an electric toaster
rated at 110 V into a 220-V
outlet, current in the toaster will
be
a. twice what it should be.
b. the same as if it were
plugged into 110 V.
c. half what it should be.
d. more than twice what it
should be.
e. none of the above
When an 8-V battery is
connected to a resistor, 2 A of
current flows in the resistor.
What is the resistor's value?
a.
b.
c.
d.
e.
2 ohms
4 ohms
8 ohms
16 ohms
more than 16 ohms
When an 8-V battery is
connected to a resistor, 2 A of
current flows in the resistor.
What is the resistor's value?
a.
b.
c.
d.
e.
2 ohms
4 ohms
8 ohms
16 ohms
more than 16 ohms
The current through a 5-ohm
resistor connected to a 150-V
power supply is
a.
b.
c.
d.
e.
1A.
10 A.
30 A.
150 A.
none of the above
The current through a 5-ohm
resistor connected to a 150-V
power supply is
a.
b.
c.
d.
e.
1A.
10 A.
30 A.
150 A.
none of the above
A 15-ohm resistor has a 5-A
current in it. What is the
voltage across the resistor?
a.
b.
c.
d.
e.
5V
15 V
20 V
25 V
more than 25 V
A 15-ohm resistor has a 5-A
current in it. What is the
voltage across the resistor?
a.
b.
c.
d.
e.
5V
15 V
20 V
25 V
more than 25 V
What is the resistance of a
toaster that uses 5 A of
current when connected to a
120-volt power source?
a.
b.
c.
d.
e.
5 ohms
24 ohms
120 ohms
600 ohms
none of the above
What is the resistance of a
toaster that uses 5 A of
current when connected to a
120-volt power source?
a.
b.
c.
d.
e.
5 ohms
24 ohms
120 ohms
600 ohms
none of the above
If you accidentally grabbed the
prongs of a partially plugged-in 120V electrical plug on a day when your
skin resistance was 130,000 ohms,
how much current would pass
through your body?
a.
b.
c.
d.
e.
0.0009 A
120 A
1,083 A
130,000 A
15,600,000 A
If you accidentally grabbed the
prongs of a partially plugged-in 120V electrical plug on a day when your
skin resistance was 130,000 ohms,
how much current would pass
through your body?
a.
b.
c.
d.
e.
0.0009 A
120 A
1,083 A
130,000 A
15,600,000 A
The primary reason a bird can
perch harmlessly on bare high
voltage wires is that
a. a bird's feet are close
together.
b. a bird has a very large
electrical resistance.
c.
there is no potential
difference across the bird's feet.
d. all of the above
The primary reason a bird can
perch harmlessly on bare high
voltage wires is that
a. a bird's feet are close
together.
b. a bird has a very large
electrical resistance.
c. there is no potential
difference across the bird's
feet.
d. all of the above
Alternating current is made by
a. alternating current and
voltage.
b. alternating the direction
of voltage of the power
source.
c. huge chemical batteries.
d. none of the above
Alternating current is made by
a. alternating current and
voltage.
b. alternating the direction
of voltage of the power
source.
c. huge chemical batteries.
d. none of the above
Current from a battery is
always
a.
b.
DC.
AC.
Current from a battery is
always
a.
b.
DC.
AC.
Power outlets in our homes
typically have a potential
difference of
a.
b.
c.
d.
e.
30 V.
120 A.
60 A.
240 V.
120 V.
Power outlets in our homes
typically have a potential
difference of
a.
b.
c.
d.
e.
30 V.
120 A.
60 A.
240 V.
120 V.
In 2004, the number of
electrons delivered to an
average American home by
an average power utility was
a.
b.
c.
d.
e.
zero.
110.
220.
billions of billions.
none of the above
In 2004, the number of
electrons delivered to an
average American home by
an average power utility was
a.
b.
c.
d.
e.
zero.
110.
220.
billions of billions.
none of the above
Electric power is defined as
a. current times voltage.
b. current divided by
voltage.
c. current times resistance.
d. resistance times voltage.
e. voltage divided by
current.
Electric power is defined as
a. current times voltage.
b. current divided by
voltage.
c. current times resistance.
d. resistance times voltage.
e. voltage divided by
current.
How much power is used by a
12-V battery that draws 0.5 A
of current?
a.
b.
c.
d.
e.
0.5 W
6W
12 W
24 W
30 W
How much power is used by a
12-V battery that draws 0.5 A
of current?
a.
b.
c.
d.
e.
0.5 W
6W
12 W
24 W
30 W
A light bulb is plugged into a
120-volt outlet and has a 0.7 A
current in it. What is the power
rating of the light bulb?
a.
b.
c.
d.
e.
12 W
17 W
84 W
120 W
171 W
A light bulb is plugged into a
120-volt outlet and has a 0.7 A
current in it. What is the power
rating of the light bulb?
a.
b.
c.
d.
e.
12 W
17 W
84 W
120 W
171 W
Electrical potential energy is
the energy a charged object
has because of its
a.
b.
c.
d.
e.
momentum.
location.
mass.
motion.
volume.
Electrical potential energy is
the energy a charged object
has because of its
a.
b.
c.
d.
e.
momentum.
location.
mass.
motion.
volume.
A small, positively charged
object near a positively
charged sphere is moved
closer to the sphere. The
electrical potential energy of
the small object
a.
b.
c.
stays the same.
decreases.
increases.
A small, positively charged
object near a positively
charged sphere is moved
closer to the sphere. The
electrical potential energy of
the small object
a.
b.
c.
stays the same.
decreases.
increases.
When an electron is brought near a
negatively charged sphere, its
potential energy increases. The
reason this happens is that
a.
two like charges go from a
position far apart to a position close
together.
b.
negative charges repel each
other.
c.
work was done to bring the
charges together.
d.
none of the above
When an electron is brought near a
negatively charged sphere, its
potential energy increases. The
reason this happens is that
a.
two like charges go from a
position far apart to a position close
together.
b.
negative charges repel each
other.
c.
work was done to bring the
charges together.
d.
none of the above
If two negative charges are
held close together and then
released, the charges will
a. accelerate toward each
other.
b. accelerate away from
each other.
c. not move.
d. move at a constant
speed away from each other.
If two negative charges are
held close together and then
released, the charges will
a. accelerate toward each
other.
b. accelerate away from
each other.
c. not move.
d. move at a constant
speed away from each other.
Electric potential is defined as
a. electrical potential energy of
a charge multiplied by the
quantity of the charge.
b. electrical potential energy of
a charge divided by the quantity
of the charge.
c. electrical potential energy.
d. gravitational potential.
e. voltage.
Electric potential is defined as
a. electrical potential energy of
a charge multiplied by the
quantity of the charge.
b. electrical potential energy
of a charge divided by the
quantity of the charge.
c. electrical potential energy.
d. gravitational potential.
e. voltage.
A volt is a unit of
a.
b.
c.
d.
e.
charge.
electric potential.
energy.
work.
current.
A volt is a unit of
a.
b.
c.
d.
e.
charge.
electric potential.
energy.
work.
current.
After you rub a balloon on
your hair, the balloon will likely
be charged
a.
b.
c.
d.
to less than 10 volts.
to several hundred volts.
to several thousand volts.
not at all.
After you rub a balloon on
your hair, the balloon will likely
be charged
a. to less than 10 volts.
b. to several hundred volts.
c. to several thousand
volts.
d. not at all.
In order for there to be a flow
of charge from one place to
another, there must be a
a. conductor, such as a
wire, connecting the two
places.
b. potential difference
between the two places.
c. Both A and B above
In order for there to be a flow
of charge from one place to
another, there must be a
a. conductor, such as a
wire, connecting the two
places.
b. potential difference
between the two places.
c. Both A and B above
In solid conductors, electric
current is the flow of
a. positive and negative
charges.
b. electrons.
c. negative ions.
d. protons.
e. none of the above
In solid conductors, electric
current is the flow of
a. positive and negative
charges.
b. electrons.
c. negative ions.
d. protons.
e. none of the above
An ampere is a
a.
b.
c.
d.
e.
unit of resistance.
unit of current.
type of charge.
voltage.
current.
An ampere is a
a.
b.
c.
d.
e.
unit of resistance.
unit of current.
type of charge.
voltage.
current.
An example of a voltage
source is
a.
b.
c.
d.
fur.
e.
a dry cell.
a generator.
a car battery.
rubbing a rubber rod with
all of the above
An example of a voltage
source is
a.
b.
c.
d.
fur.
e.
a dry cell.
a generator.
a car battery.
rubbing a rubber rod with
all of the above
Electrical resistance in a wire
depends on the wire's
a.
b.
c.
d.
e.
thickness.
conductivity.
length.
all of the above
none of the above
Electrical resistance in a wire
depends on the wire's
a.
b.
c.
d.
e.
thickness.
conductivity.
length.
all of the above
none of the above
Compared to thin wires,
electrical resistance in thick
wires is
a.
b.
c.
less.
the same.
greater.
Compared to thin wires,
electrical resistance in thick
wires is
a.
b.
c.
less.
the same.
greater.
For most conductors, as
their temperature increases,
their resistance
a.
b.
c.
decreases.
increases.
stays the same.
For most conductors, as
their temperature increases,
their resistance
a.
b.
c.
decreases.
increases.
stays the same.
Electrical resistance is
measured in
a.
b.
c.
d.
e.
volts.
joules.
watts.
amperes.
none of the above
Electrical resistance is
measured in
a.
b.
c.
d.
e.
volts.
joules.
watts.
amperes.
none of the above
An electric heater is rated at 300
W for use in a 110-V circuit. The
circuit breaker in the circuit can
handle 12 A of current. How
many heaters can be safely
operated in the circuit?
a.
b.
c.
d.
e.
2
3
4
5
more than 5
An electric heater is rated at 300
W for use in a 110-V circuit. The
circuit breaker in the circuit can
handle 12 A of current. How
many heaters can be safely
operated in the circuit?
a.
b.
c.
d.
e.
2
3
4
5
more than 5
What is electrical resistance?
What characteristics of a wire
determine its resistance? How
does resistance normally vary
with temperature?
What is the difference
between direct current and
alternating current? When we
plug a light bulb into a wall
outlet, where do the electrons
come from?