U7.2 – Capacitors

Capacitors

1 / 16

What unit is capacitance measured in?

Coulombs²

Farads

Volts

Farquaads

2 / 16

A 300μF capacitor is charged fully to 3.2 μC, calculate the voltage of the battery that was used to charge the capacitor?

0.012 V

0.01 V

1.2 V

1 V

3 / 16

The p.d. across a capacitor is ________ to the charge stored on it.

opposite

inversely square

irrelevant

proportional

4 / 16

Which of these equations is not a correct expression of the energy stored by a capacitor?

Expression A

Expression B

Expression C

Expression D

5 / 16

Which graph best shows the charging of a capacitor?

Graph A

Graph B

Graph C

Graph D

6 / 16

Which graph best shows the discharging of a capacitor?

Graph A

Graph B

Graph C

Graph D

7 / 16

A 200 μF capacitor is charged fully to 1.6 μC, calculate the energy stored when it is fully charged.

1.25x10^-6 J

6x10^-9 J

8x10^-3 J

5.1x10^-4 J

8 / 16

A capacitor is charged fully to 300 nF with a battery of 0.5 V, calculate the energy stored when it is fully charged.

6x10¹¹ J

1.6x10⁶ J

3.7x10^-8 J

7.5x10^-8 J

9 / 16

A 200 μF capacitor is charged fully with a 3 V battery, calculate the energy stored when it is fully charged.

3x10^-4 J

0.003 J

0.015 J

6x10^-4 J

10 / 16

The potential difference across the plates of a capacitor is decreased by a half. There is no change to the capacitance of the capacitor. Which of the following statements is true?

The energy stored by the capacitor will reduce by half.

The energy stored by the capacitor will quadruple.

The energy stored by the capacitor will double.

The energy of the capacitor will reduce by a quarter.

11 / 16

A capacitor with capacitance C is charged to a potential difference of V. The energy stored on the charged capacitor is W. What would be the energy stored if the potential difference was 4V?

2 W

4 W

8 W

16 W

12 / 16

What piece of equipment could you use to measure and record the potential difference across the capacitor over time?

Datalogger and ammeter

Oscilloscope

Cathode ray tube

Lux Meter

13 / 16

The time taken to discharge (or charge) a capacitor depends on:

The capacitance of the capacitor.

The resistance of the circuit.

The capacitance of the capacitor and the resistance of the circuit.

None of the above.

14 / 16

In this equation to calculate the charge remaining on the capacitor, what does Q₀ represent?

The charge of the capacitor when it's fully charged.

The charge of the capacitor before it discharges.

The lowest amount of charge the capacitor can hold.

15 / 16

What is meant by the time constant of a resistor-capacitor circuit in terms of potential difference?

The time taken for the potential difference to decrease by 50%

The time taken for the for the potential difference to reduce by 37%

The time taken for the for the potential difference to reduce by 63%

The time taken for the for the potential difference to reduce by 100%

16 / 16

Which equation shows the natural log being taken of the discharge equation for charge?

Equation A

Equation B

Equation C

Equation D

Thank you for taking the quiz. Please fill in the fields below and you will receive your results in an email.

If you have been set this as homework, you should forward this email to your teacher as evidence you have completed the quiz.

If you don't receive your email please check your spam or junk folder.

Your score is

0%

Recent Posts

Categories