Download Choose the best answer to each question and write the appropriate

Choose the best answer to each question and write the appropriate letter in the space provided.
1)
Where do the electrons come from that produce heat and light in a light bulb?
A)
The air
B)
The wall plug
C)
The power company
D)
The bulb's wire filament
E)
none of the above
________
2)
Alternating current is made by __________.
A)
alternating the direction of voltage of the power source.
B)
huge chemical batteries.
C)
alternating current and voltage.
D)
none of the above
________
3)
Compared to thin wires, electrical resistance in thick wires is __________.
A)
less.
B)
the same.
C)
greater.
________
4)
The resistance of your dry skin is usually around __________.
A)
1 ohm.
B)
millions of ohms.
C)
100 ohms.
D)
0.001 ohm.
E)
100 000 ohms.
________
5)
A 60-watt light bulb is connected to a 120-V outlet. How much current exists in the light bulb?
A)
4A
B)
2A
C)
0.5 A
D)
0.25 A
E)
More than 4 A
________
6)
In 1986, the number of electrons delivered to an average American home by an average power
utility was __________.
A)
110.
B)
billions of billions.
C)
zero.
D)
220.
E)
none of the above
________
7)
When plugged into a 120-V wall outlet, how much current is used by a toaster rated at 1200 W?
A)
144 000 A
B)
1200 A
C)
10 A
D)
120 A
E)
none of the above
________
8)
Power outlets in our homes typically have a potential difference of __________.
A)
60 A.
B)
120 A.
C)
30 V.
D)
240 V.
E)
120 V.
________
9)
The current through a 10-ohm resistor connected to a 120-V power supply is __________.
A)
10 A.
B)
12 A.
C)
120 A.
D)
1 A.
E)
none of the above
________
10)
What is the resistance of a toaster that uses 2 A of current when connected to a 120-volt power
source?
A)
120 ohms
B)
60 ohms
C)
240 ohms
D)
2 ohms
E)
none of the above
_______
11)
Current from a battery is always __________.
A)
DC.
B)
AC.
_______
12)
Electrical resistance in a wire depends on the wire's __________.
A)
length.
B)
thickness.
C)
conductivity.
D)
all of the above
E)
none of the above
_______
13)
An ampere is a __________.
A)
voltage.
B)
current.
C)
unit of current.
D)
type of charge.
E)
unit of resistance.
_______
14)
The net speed of electrons in a wire is about __________.
A)
10 m/s.
B)
0.01 cm/s.
C)
the speed of light.
D)
100 kilometers per hour.
E)
a few million kilometers per hour.
_______
15)
An electric heater is rated at 300 W for use in a 110-V circuit. The safety fuse in the circuit can
handle 15A of current. How many heaters can be safely operated in the circuit?
A)
More than 5
B)
4
C)
2
D)
3
E)
5
_______
1)
Answer:
D
2)
Answer:
A
3)
Answer:
A
4)
Answer:
E
5)
Answer:
C
6)
Answer:
C
7)
Answer:
C
8)
Answer:
E
9)
Answer:
B
10)
Answer:
B
11)
Answer:
A
12)
Answer:
D
13)
Answer:
C
14)
Answer:
B
15)
Answer:
E