P.3.7.4.4 Capacitor charge and discharge
Quiz
•
Physics
•
11th - 12th Grade
•
Hard
Stanton Wertjes
Used 25+ times
FREE Resource
20 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A capacitor of capacitance 120 μF is charged and then discharged through a 20 kΩ resistor. What fraction of the original charge remains on the capacitor 4.8 s after the discharge begins?
0.14
0.37
0.63
0.86
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A 500 µF capacitor is charged to a pd of 10.0 V. It is then discharged through a 100 kΩ resistor.
What is the time taken for the pd to fall from 10.0 V to 5.0 V?
35 s
50 s
72 s
100 s
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A voltage sensor and a datalogger are used to record the discharge of a 10 mF capacitor in series with a 500 Ω resistor from an initial pd of 6.0 V. The datalogger is capable of recording 1000 readings in 10 s.
After a time equal to the time constant of the discharge circuit, which one of the rows gives the pd and the number of readings made?
Potential difference / V: 2.2
Number of readings: 50
Potential difference / V: 3.8
Number of readings: 50
Potential difference / V: 3.8
Number of readings: 500
Potential difference / V: 2.2
Number of readings: 500
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The capacitor in the circuit is initially uncharged. The switch S is closed at time t = 0.
Which pair of graphs, A to D, correctly shows how the pd across the capacitor and the current in the circuit change with time?
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When fully charged the 2.0 mF capacitor used as a backup for a memory unit has a potential difference of 5.0 V across it. The capacitor is required to supply a constant current of 1.0 μA and can be used until the potential difference across it falls by 10%. For how long can the capacitor be used before it must be recharged?
10 s
100 s
200 s
1000 s
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Switch S in the circuit is held in position 1, so that the capacitor C becomes fully charged to a pd V and stores energy E. The switch is then moved quickly to position 2, allowing C to discharge through the fixed resistor R. It takes 36 ms for the pd across C to fall to V/2.
What period of time must elapse, after the switch has moved to position 2, before the energy stored by C has fallen to E/16?
51 ms
72 ms
432 ms
576 ms
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In the circuit shown the capacitor C charges when switch S is closed. Which line, A to D, in the table gives a correct pair of graphs showing how the charge on the capacitor and the current in the circuit change with time after S is closed?
A
B
C
D
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