1. Clicker questions – AP C Circuits

2. The same potential difference is applied across two wires
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? R 2R
R/2 4R
R/4

3. 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
power.
resistance.
emf.
charge.
work per unit charge.

4. A resistor carries a current I
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? P 3P
P/3 9P
P/9

5. Four identical light bulbs are connected to a power supply as shown
Four identical light bulbs are connected to a power supply as shown. Which light bulb consumes the most power? B1 B2 B3 B4
They all consume the same amount of power.

6. Which of the following relations among the quantities in the figure is generally correct?
I1R1 = I2R2
I3R3 = I4R4
I1R1 = I4R4
I3R4 = I4R3
I1R1 + I2R2 = e

7. Three resistors are placed in a simple circuit
Three resistors are placed in a simple circuit. In which of the various configurations shown do all three resistors carry the same current?

8. Four identical light bulbs are connected to a power supply as shown
Four identical light bulbs are connected to a power supply as shown. Which light bulb consumes the most power? B1 B2 B3 B4
They all consume the same amount of power.

9. 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?
I1 = I2
I2 = I3
I3 = I4
I1 = I4
I1 = I2 + I3

10. 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?
Connect both meters in parallel.
Connect both meters in series.
You should connect the ammeter in parallel and the voltmeter in series.
You should connect the ammeter in series and the voltmeter in parallel.
It does not matter how you connect the meters to the resistor.

11. Which curve best represents the charge on the capacitor in a charging RC circuit as a function of time?

12. Which curve best represents the current in a discharging RC circuit as a function of time?

13. The light bulb goes on but goes off immediately.
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.
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.

14. The switch S is initially at position b for a long 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.
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.

15. Tony charges a capacitor and then discharges it through a resistor
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.
0.368
0.135
0.0498
0.0183

16. Answers
C, B, D, E, B, C, A, A, D, D, B, C,C