P.3.7.4.4 Capacitor charge and discharge

P.3.7.4.4 Capacitor charge and discharge

11th - 12th Grade

20 Qs

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P.3.7.4.4 Capacitor charge and discharge

P.3.7.4.4 Capacitor charge and discharge

Assessment

Quiz

Physics

11th - 12th Grade

Hard

Created by

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

Media Image

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

Media Image

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?

Media Image
Media Image
Media Image
Media Image

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

Media Image

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

Media Image

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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