Download Clicker Question 21-1 Which light bulb(s) will light up?

Clicker Question 21-1
Which light bulb(s) will light up?
a) 
b) 
c) 
d) 
e) 
A only
B only
C only
A and C
B and C
A
B
C
Clicker Question 21-2
You double the voltage across a certain conductor
and you observe the current increases three times.
What can you conclude?
a)  Ohm’s law is obeyed since the current still increases
when V increases.
b)  Ohm’s law is not obeyed.
c)  This has nothing to do with Ohm’s law.
Clicker question 21-3
A wire of resistance R is stretched uniformly (keeping its
volume constant) until it is twice its original length. What
happens to the resistance?
a) 
b) 
c) 
d) 
e) 
It decreases by a factor of 4.
It decreases by a factor of 2.
It stays the same.
It increases by a factor of 2.
It increases by a factor of 4.
Clicker Question 22-1
Assume that the voltage of the battery is 9 V and that the three
resistors are identical. What is the potential difference across
each resistor?
a) 
b) 
c) 
d) 
e) 
12 V
zero
3V
4V
you need to know the actual value of R
9V
Clicker Question 22-2
Points P and Q are connected to an ideal
battery of fixed voltage. As more resistors R
are added to the parallel circuit, what
happens to the total current in the circuit?
a) 
b) 
c) 
d) 
Increases
Remains the same
Decreases
Drops to zero
Clicker Question 22-3
Two light bulbs A and B are connected in series to a constant
voltage source. When the switch is closed, bulb A will:
a) 
b) 
c) 
d) 
e) 
glow brighter than before
glow just the same as before
glow dimmer than before
go out completely
explode
Clicker question 23-1
If a current of 2.0 A is flowing from point a to point b, the
potential difference between the points is
a) 
b) 
c) 
d) 
e) 
6V
8V
14 V
20 V
22 V
Clicker question 23-2
Three identical light bulbs are connected in parallel to a constant voltage
power supply. Initially, switch S1 is closed and the other two switches open.
When the other two switches, S2 and S3, are closed, the brightness of the
first light bulb
a) 
b) 
c) 
is dimmer.
is unchanged.
is brighter.
s0
V
s1
?+
?
-
B1
s2
B2
s3
B3
Clicker Question 23-3
The light bulbs in the circuit are identical. When the switch is
closed, what happens to the light bulbs?
a) 
b) 
c) 
d) 
e) 
Both bulbs go out.
Both get brighter.
Both get dimmer.
A gets brighter and B gets dimmer.
The brightness of both remain the same.
Clicker question 24-1
Several different capacitors are hooked across a DC
battery in parallel. The potential difference across
each capacitor is
a)  directly proportional to its capacitance.
b)  inversely proportional to its capacitance.
c)  independent of its capacitance.
a S
V
?
?
b
Clicker question 24-2
bulb
C
The switch S is initially at position a for a long time. It is then switched to position b.
Describe what happens to the light bulb as a function of time after the switch is flipped
from a to b.
a) 
b) 
c) 
d) 
e) 
The light bulb goes on but goes off immediately.
The light bulb goes off and stays off.
The light bulb goes on but its brightness decreases with time and eventually goes off.
The light bulb goes on and stays on at a constant brightness.
The light bulb goes on but its brightness increases with time.
a S
V
?
?
b
Clicker question 24-3
bulb
C
The switch S is initially at position b for a long time. It is then switched to position a.
Describe what happens to the light bulb as a function of time after the switch is
flipped from b to a.
a) 
b) 
c) 
d) 
e) 
The light bulb goes on but goes off immediately.
The light bulb goes off and stays off.
The light bulb goes on but its brightness decreases with time and eventually goes off.
The light bulb goes on and stays on at a constant brightness.
The light bulb goes on but its brightness increases with time.
Clicker Question 25-1
What happens to the potential drop across the resistor
R1 when the switch is closed?
a)  increases
b)  decreases
c)  stays the same
R1
S
V
R2
R3
Clicker Question 25-2
What happens to the potential drop across the resistor
R4 when the switch is closed?
a)  increases
b)  decreases
c)  stays the same
R1
S
V
R2
R3
R4
Clicker Question 25-3
How does the voltage V1 across the first capacitor (C1) compare to the
voltage V2 across the second capacitor (C2)? All the capacitors are identical.
a) 
V1 = V2
b) 
V1 > V2
c) 
V1 < V2
d) 
all voltages are zero
C2
V
C1
C3