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Clicker questions – AP C
Circuits
The same potential difference is applied across
two wires. Wire A carries twice the current of
wire B. If the resistance of wire B is R, what is the
resistance of wire A?
A.
B.
C.
D.
E.
R
2R
R/2
4R
R/4
The graph shows the potential difference
across a resistor as a function of the
current through the resistor. The slope of
the resulting curve represents
A.
B.
C.
D.
E.
power.
resistance.
emf.
charge.
work per unit charge.
A resistor carries a current I. The power dissipated
in the resistor is P. What is the power dissipated if
the same resistor carries current 3I?
A.
B.
C.
D.
E.
P
3P
P/3
9P
P/9
Four identical light bulbs
are connected to a
power supply as shown.
Which light bulb
consumes the most
power?
A.
B.
C.
D.
E.
B1
B2
B3
B4
They all consume the same amount of power.
B1
B2
B3
B4


V
Which of the following relations among
the quantities in the figure is generally
correct?
A.
B.
C.
D.
E.
I1R1 = I2R2
I3R3 = I4R4
I1R1 = I4R4
I3R4 = I4R3
I1R1 + I2R2 = e
Three resistors are placed in a simple
circuit. In which of the various
configurations shown do all three
resistors carry the same current?
Four identical light bulbs are
connected to a power
supply as shown. Which
light bulb consumes the
most power?
A.
B.
C.
D.
E.
B1
B2
B3
B1
B2


B3
B4
They all consume the same amount of power. V
B4
The circuit in the figure contains a cell of emf e and four
resistors connected as shown. Let the currents in the resistors
R1, R2, R3, R4, be designated by I1, I2, I3, I4, respectively. Which
of the following equations is necessarily correct?
A.
B.
C.
D.
E.
I1 = I2
I2 = I3
I3 = I4
I1 = I4
I1 = I2 + I3
You want to measure the current through and the
voltage difference across a resistor. How should you
connect the ammeter and voltmeter to the resistor?
A. Connect both meters in parallel.
B. Connect both meters in series.
C. You should connect the ammeter in parallel and
the voltmeter in series.
D. You should connect the ammeter in series and
the voltmeter in parallel.
E. It does not matter how you connect the meters
to the resistor.
Which curve best represents the charge
on the capacitor in a charging RC circuit
as a function of time?
Which curve best represents the current
in a discharging RC circuit as a function of
time?
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 S
V


bulb
b
C
A. The light bulb goes on but goes off immediately.
B. The light bulb goes off and stays off.
C. The light bulb goes on but its brightness decreases
with time and eventually goes off.
D. The light bulb goes on and stays on at a constant
brightness.
E. The light bulb goes on but its brightness increases
with time.
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 S
V
A.
B.
C.
D.
E.


bulb
b
C
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.
Tony charges a capacitor and then discharges it
through a resistor. He notices that, after two time
constants, the voltage across the capacitor has
decreased to _____ of its value just prior to the
initiation of the discharge.
A.
B.
C.
D.
E.
0.368
0.135
0.0498
0.0183
0.00674
Answers
• C, B, D, E, B, C, A, A, D, D, B, C,C