Capacitors and Capacitance

Question 1

What is a capacitor?

Answer 1

A component used to store charge

Question 2

What is the abbreviation for capacitors and its unit of measurement?

Answer 2

C
Unit Farad (F)

Question 3

Define capacitance

Answer 3

The measure of how much charge can be stored

The ability of a dielectric or insulator to store an electric charge

Question 4

What are the three schematic symbols for capacitors?

Answer 4

Electrolytic -One straight line and one curve line(usually the -ve)

Non-polarized capacitor – two straight lines (no positive or negative terminal )

Variable capacitor – two straight lines with a diagonal line through them

Question 5

How is a capacitor made up

Answer 5

Two parallel conductive plates separated by a electric

Question 6

Examples of dielectric(insulating) materials

Answer 6

Ceramic polyester film

Question 7

What three factors determine the capacitors of a capacitor
Speak about their proportionality to capacitance, and therefore the formula

Answer 7

The surface area of the conducting plates C ∝ A

The distance between the plates C ∝ 1/d

The dielectric constant of the insulated material C ∝ ε

C = ε A/d

Question 8

Capacitance formula

Answer 8

C = ε A/d

Question 9

What does the working voltage of capacitor determine?

Answer 9

The maximum amount of potential difference between the plates, the capacitor can’t handle before puncturing or destroying the dielectric

Question 10

The charges on both the plates the same? And what does the your answer cause

Answer 10

No one plate is positively charged and the other is is negative charge
This creates an electric field in the dielectric

Question 11

how is charge stored in capacitor?

Answer 11

By establishing an electric field between the two plates and the dielectric concentrating it

Question 12

A charge capacitor traps what?

Answer 12

Positive charges on one plate and negative on the other

Question 13

How is a capacitor discharged?

Answer 13

 by shorting the circuit this means connecting one terminal to the other terminal, using a conductor

Question 14

What happens when capacitors are placed in parallel? What is this equivalent to ?

Answer 14

Total capacitance increases
It’s is equivalent to increase in the plate area

Question 15

What happens when you please capacitors in series? What is this equivalent to?

Answer 15

The total capacitance decreases
Equivalent to increasing the distance between the plates

Question 16

Capacitors in parallel

Answer 16

CT=C1+C2+C3
Opposite resistors in parallel

Question 17

Capacitors in series

Answer 17

1/CT = 1/C1 +1/C2 + 1/C3

Question 18

For capacitors in series, you can also use What to solve them for special

Answer 18

 the formula for special cases in paras circuits

Question 19

When solving capacitors in series parallel where should you start?

Answer 19

The capacitor furthest from the point of interest

Question 20

As the capacitor charges, what happens to the current and voltage?

Answer 20

The current exponentially decays and the voltage exponentially increases until it reaches the voltage of the supply voltage

Question 21

What are the exponential equations for the charging capacitor? Current n voltage

Answer 21

I꜀= Iₘₐₓ e-ᵗ/τ
V꜀= Eₘₐₓ 1-e-ᵗ/τ

Question 22

Another formula for Ic

Answer 22

Es/ R(ε -ᵗ/τ)

Question 23

τ=

Answer 23

RC
Resistance in ohm
Capacitors MUST be in Farads
And unitnos secs

Question 24

What happens the instant is switch is moved position one for a capacitor to charge

Answer 24

Current begins to flow clockwise, controlled by R through the positive top plate and negative bottom plate. Voltage drop develops across the plate. And the charge continues to flow until is equal C=Es

Question 25

When is a capacitor fully charged

Answer 25

When the capacity is equal to the supply voltage

Question 26

What happens the instant to switch is move in position to for the capacitor to discharge?

Answer 26

The electric field begins to we can as the discharge can flows through R to the bottom plate in E a anticlockwise direction and continues to flow until there’s no electric field

Question 27

Charge of capacitor formula, unit and explain it

Answer 27

Q=CV Coulombs C The charge stored in the capacitor is directly proportional to the voltage across the plates and capacitors

Question 28

What is one farad defined as

Answer 28

C=Q/V The capacitance required to store one columb of charge with the potential difference of one volt

Question 29

Energy stored in a capacitor

Answer 29

W=1/2 CV²

Question 30

When capacitors are connected in series, what can they said about their charge

Answer 30

Since charge is like current the charge throughout is the same

Question 31

What can be said about the voltage across the capacitor when it is connected in series? What equation do you associate with it

Answer 31

The voltage across each capacitor is inversely proportional to its capacitance Q=CV V=Q/V

Question 32

What can be said about the voltage and current in a parallel capacitor circuit?

Answer 32

If we dig across each capacitor is the same Whilst the current varies

Question 33

Define a time constant of a capacitor

Answer 33

The rate of charge or discharge of a capacitor

Question 34

When does a capacitor become virtually fully discharged or charged?

Answer 34

After five time constants

Question 35

How does the resistance in capacitance behave when charging or discharging in terms of its curve

Answer 35

It behaves exactly like the current

Question 36

Vr formula for capacitance

Answer 36

Es(e-ᵗ/τ) Vr =Es-Vc

Question 37

Although ic decays when discharging when calculating you us

Answer 37

It starts the increasing function