Free Printable Understanding Capacitors and Their Functions

1.

What is the SI unit of capacitance?

a)

Ohm

b)

Farad

c)

Henry

d)

Volt

2.

Which of the following best describes the process of charging a capacitor?

a)

Electrons are removed from both plates

b)

Electrons accumulate on one plate and are removed from the other

c)

Both plates gain electrons

d)

Both plates lose electrons

3.

A capacitor is marked as "104". What is its capacitance value?

a)

10 μF

b)

100 nF

c)

0.1 μF

d)

0.01 μF

4.

Which equation correctly relates charge ( $Q$ ), capacitance ( $C$ ), and voltage ( $V$ )?

a)

$Q = C \times V$

b)

$Q = \frac{C}{V}$

c)

$Q = V - C$

d)

$Q = C + V$

5.

What is the typical unit used for small capacitance values in electronic circuits?

a)

Microfarad (μF)

b)

Kilofarad (kF)

c)

Millifarad (mF)

d)

Farad (F)

6.

If a capacitor is marked "472", what is its capacitance?

a)

4.7 μF

b)

4700 pF

c)

47 nF

d)

470 nF

7.

During the discharging of a capacitor, what happens to the voltage across its plates?

a)

It increases

b)

It remains constant

c)

It decreases

d)

It fluctuates randomly

8.

Which of the following is NOT a standard marking for capacitance values?

a)

103

b)

224

c)

0.47

d)

681

9.

A capacitor has a value of 220 μF. What is this in farads?

a)

$2.2 \times 10^{-4}$ F

b)

$2.2 \times 10^{-3}$ F

c)

$2.2 \times 10^{-2}$ F

d)

$2.2 \times 10^{-1}$ F

10.

Which of the following is the correct symbol for a capacitor in a circuit diagram?

a)

A zigzag line

b)

Two parallel lines

c)

A circle

d)

A triangle

11.

What does the marking "1μF" on a capacitor indicate?

a)

1 millifarad

b)

1 microfarad

c)

1 nanofarad

d)

1 picofarad

12.

Which of the following best describes the energy stored in a capacitor?

a)

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

b)

$E = CV$

c)

$E = V^2C$

d)

$E = \frac{1}{2}VC^2$

13.

A capacitor marked "333" has what value?

a)

33 nF

b)

330 nF

c)

3.3 nF

d)

33,000 pF

14.

Which of the following is the largest capacitance value?

a)

100 pF

b)

0.1 μF

c)

10 nF

d)

1 μF

15.

What is the time constant ( $\tau$ ) for a capacitor in a circuit with resistance $R$ ?

a)

$\tau = RC$

b)

$\tau = \frac{R}{C}$

c)

$\tau = C + R$

d)

$\tau = \frac{C}{R}$

16.

Which marking would you expect to find on a capacitor with a value of 0.01 μF?

a)

103

b)

104

c)

102

d)

100

17.

If a capacitor is marked "221", what is its value?

a)

220 pF

b)

220 nF

c)

220 μF

d)

220 F

18.

Which of the following is NOT a unit of capacitance?

a)

Farad

b)

Microfarad

c)

Nanofarad

d)

Ampere

19.

What happens to the current in a circuit as a capacitor charges?

a)

It remains constant

b)

It increases

c)

It decreases

d)

It fluctuates randomly

20.

A capacitor marked "470n" has what value?

a)

470 μF

b)

470 nF

c)

470 pF

d)

470 F

Understanding Capacitors and Their Functions

Total questions: 20

Worksheet time: 10mins

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