Free Printable 4.1 Capacitators

1.

Which of the following is symbol of capacitor ?

a)

b)

c)

d)

2.

A capacitor is a pair of (a) separated by an (b) . If a (c) is placed across the plates they acquire (d) charges.

Choose from the below words

conducting plates

insulator

potential difference

equal and opposite

vacuum

clowns

voltmeter

conductor

conducting wires

3.

What are the units of capacitance? (Two possible answers)

a)

JC^-1

b)

CV^-1

c)

C

d)

F

4.

A dielectric is an (a) material. This (b) the value of capacitance. At A level the dielectric is usually (c) or a vacuum.

Choose from the below words

insulating

increases

air

silicon

conducting

decreases

5.

A capacitor is a device that stores charge and energy.

a)

True

b)

False

6.

The amount of charge that a capacitor can accept is determined by

a)

It's capacity C=Q/V

b)

the plate area

c)

the dielectric thickness

d)

all of the above

7.

When a capacitor discharges

a)

current reverses direction compared to the charge current

b)

it acts like a DC open

c)

the electrostatic charge remains

d)

plate voltage increases

8.

The equivalent capacitance of three capacitors with capacitance $C_1,\ C_2\ and\ C_3$ connected in parallel is

a)

$C=C_1+C_2+C_3$

b)

$\frac{1}{C}=\frac{1}{C_1}+\frac{1}{C_2}+\frac{1}{C_3}$

c)

$C=\frac{1}{C_1}+\frac{1}{C_2}+\frac{1}{C_3}$

d)

$C=C_1C_2C_3$

9.

The equivalent capacitance of three capacitors with capacitance $C_1,\ C_2\ and\ C_3$ connected in series is

a)

$C=C_1+C_2+C_3$

b)

$\frac{1}{C}=\frac{1}{C_1}+\frac{1}{C_2}+\frac{1}{C_3}$

c)

$C=\frac{1}{C_1}+\frac{1}{C_2}+\frac{1}{C_3}$

d)

$\frac{1}{C}=\frac{1}{C_1}\times\frac{1}{C_2}\times\frac{1}{C_3}$

10.

With respect to the capacitor, which relationship is true? •

a)

C = Q×V

b)

V = C×Q

c)

V = Q/C

d)

Q = C/V

11.

Which of the following is true about a fully charged capacitor

a)

the charge on the two plates is equal but opposite

b)

the p.d across supply is the same as the p.d across the capacitor plates

c)

no charge flows between the plates

d)

all of the above is true

12.

$C=\frac{\epsilon_0X}{Y}$

What do the symbols X and Y represent?

a)

X is d, the distance between the plates

Y is A, the area of the plates.

b)

X is A, the area of the plates.

Y is d, the distance between the plates

c)

X is V, the p.d across the plates.

Y is E, the electric field between the plates

d)

X is the electric field between the plates

Y is V, the p.d across the plates.

13.

Put the correct equations under the correct headings

Categorize the following

$\frac{1}{2}QV$

$\frac{1}{2}CV^2$

$\frac{1}{2}\ \frac{Q}{C}^2$

CV

$Q_0e^{-\frac{t}{RC}}$

$Q_0\left(1-e^{-\frac{t}{RC}}\right)$

Energy Stored in a Capcitor

Charge on a capacitor

Discharging a capacitor

Charging a capacitor

14.

What happens to the current in the circuit during the charging process of a capacitor?

a)

Decreases over time

b)

Increases over time

c)

Remains constant

15.

What happens to the charge in a capacitor during the discharging process?

a)

Increases over time

b)

Decreases over time

c)

Remains the same

16.

Which is the Q vs t graph for the charging process of a capacitor?

a)

a

b)

b

17.

Capacitors charge and discharge in a __________ manner.

a)

Linear

b)

Constant

c)

Square

d)

Exponential

18.

The capacitance C is charged through a resistor R. The time constant of the charging circuit is given by

a)

C/R

b)

1/RC

c)

RC

d)

R/C

19.

Which of the following depends on charging and discharging rate of a capacitor?

a)

Time constant

b)

Current

c)

Power

d)

Voltage

20.

The time constant can be found for CHARGING a capacitor when the capacitor is (a) charged.

The time constant when DISCHARGING a capacitor is found when the capacitor is (b) charged.

Choose from the below words

63%

37%

50%

100%

21.

This circuit is used for charging and discharging a capacitor.

What is the purpose of the cell?

a)

To provide a pd to charge the capacitor.

b)

To switch between the charging and discharging circuit

c)

To provide a pathway to allow the charge to dissipate

d)

Slows down the flow of charge to allow measurements to be taken over time

22.

This circuit is used for charging and discharging a capacitor.

What is the purpose of the resistor?

a)

To provide a pd to charge the capacitor.

b)

To switch between the charging and discharging circuit

c)

To provide a pathway to allow the charge to dissipate

d)

Slows down the flow of charge to allow measurements to be taken over time

23.

This circuit is used for charging and discharging a capacitor.

What is the purpose of the switch?

a)

To provide a pd to charge the capacitor.

b)

To switch between the charging and discharging circuit

c)

To provide a pathway to allow the charge to dissipate

d)

Slows down the flow of charge to allow measurements to be taken over time

24.

This circuit is used for charging and discharging a capacitor.

What is the purpose of the discharging circuit with no voltage supply?

a)

To provide a pd to charge the capacitor.

b)

To switch between the charging and discharging circuit

c)

To provide a pathway to allow the charge to dissipate

d)

Slows down the flow of charge to allow measurements to be taken over time

4.1 Capacitators

Total questions: 24

Worksheet time: 23mins

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