PHYSICS

Question 1

Capacitors are used commonly and are useful as electronic
component in the modern circuits and devices. This has long history usage
of more than _____ years and was being studied, designed and developed up
to the present.

Answer 1

250

Question 2

passive device for storing electric charges.

Answer 2

Capacitor

Question 3

The simplest type of capacitor consists of two parallel conducting plates
separated from each other by a thin sheet of insulating material or ___________

Answer 3

dielectric

Question 4

-
-

Each of these has advantages and disadvantages
based on _______, _____________, ___________

Answer 4

parallel-plate, spherical, and cylindrical.

capacitance, charge, and potential difference.

Question 5

this type of capacitor has two parallel charging plates are separated by a dielectric that contains charges.

Answer 5

Parallel- plate capacitors

Question 6

The capacitance that can be offered by a parallel-plate capacitor is ___________ to the area of the plates as well as to the __________ between
these plates.

Answer 6

directly
proportional

distance

Question 7

type of capacitor that have different construction, inner and outer cylindrical structures.

Answer 7

Cylindrical Capacitors

Question 8

The dielectric in the cylindrical capacitor is placed ______________

Answer 8

between these
two charged cylinders (inner and outer cylindrical structures)

Question 9

The capacitance of a ____________ capacitor varies directly with its length.

Answer 9

Cylindrical capacitors

Question 10

Increasing the amount of dielectric in the cylindrical capacitor ____________ the capacitance

Answer 10

increases

Question 11

a _____ cylindrical capacitor offers higher capacitance than a _____. Such variation means that an increase in the_____ between the two charged cylinders will increase the amount of _______ to be done to move a charge from one cylinder to the other, therefore increasing the _____ across the
capacitor.

Answer 11

fat or large; thin one

distance; work

voltage

Question 12

internal spherical structure is one of the charged bodies of the _______ capacitor. The other charged body is the outer spherical structure that covers the internal sphere. This is similar to that of a cylindrical capacitor

Answer 12

Spherical capacitor

Question 13

The capacitance of this capacitor varies directly with its overall _____

Answer 13

radius

Question 14

Increasing the _____ of Spherical capacitor will enlarge the spherical surface, consequently widening the _______ between the two charged spheres with that the amount of dielectric also surges, thus ______ the capacitance offered by the
capacitor.

Answer 14

radius; distance; boosting

Question 15

boosting the capacitance of the spherical capacitor causes the work necessary to move a charge from one
sphere to another to also -______, thus intensifying the ______ across the
capacitor.

Answer 15

increase; voltage

Question 16

DIFFERENT TYPES OF CAPACITORS

Answer 16

1. Electrolytic Capacitor
2. Mica Capacitor
3. Paper Capacitor
4. Film Capacitor
5. Non-Polarized Capacitor
6. Ceramic Capacitor

Question 17

used when the large capacitor values are
required.

Answer 17

Electrolytic capacitor

Question 18

The thin metal layer in an electrolytic capacitor is used for ________
and for the second electrode (cathode) a _______ which is in jelly or paste is used.

Answer 18

one electrode ; semi-liquid
electrolyte solution

Question 19

The dielectric plate is a thin layer of _____

Answer 19

oxide (electrolytic capacitor)

Question 20

Majority of electrolytic capacitors are ______

Answer 20

polarized.

Question 21

The uses of this capacitor are generally in the DC power supply circuit
because they are in large capacitance and small in reducing ripple voltage.

Answer 21

Electrolytic capacitor

Question 22

The applications of this electrolytic capacitors are coupling and decoupling

Answer 22

Electrolytic Capacitor

Question 23

disadvantage of this is their relatively low voltage rating because of the
polarization of electrolytic capacitor.

Answer 23

Electrolytic capacitor

Question 24

This capacitor is a group of natural minerals.

Answer 24

Mica

Question 25

2 types of Mica Capacitor

Answer 25

clamped capacitors & silver mica capacitor.

Question 26

Clamped mica capacitor is considered ________ because of their inferior characteristic

Answer 26

obsolete

Question 27

_____ mica capacitor is prepared by sandwiching mica sheet coated with metal on both sides and this assembly is then encased in epoxy to protect the environment.

Answer 27

Silver

Question 28

These capacitors are low loss capacitors, used at high frequencies and is very stable chemically, electrically, and mechanically due to its specific crystalline structure binding and typical layered structure

Answer 28

Mica Capacitors

Question 29

The construction of this capacitor is between the two tin foil sheets and they are separated from the paper or oiled paper and thin waxed.

Answer 29

Paper Capacitor

Question 30

The capacitance range of this capacitor is from 0.001 to 2.000micro farad and the voltage is very high which is up to 2000V.

Answer 30

Paper Capacitor

Question 31

type of capacitor used a thin plastic as a dielectric. The film capacitor is prepared extremely thin using the sophisticated film drawing process.

Answer 31

Film capacitor

Question 32

different types of film capacitors

Answer 32

- polyester film, - metalized film, - polypropylene film - PTE film and - polystyrene film

Question 33

The main difference between these film capacitors is______ and is chose according to____

Answer 33

the material used as a dielectric and is chosen properly according to their properties

Question 34

applications of the ____ capacitors are stability, low inductance, and low cost.

Answer 34

Film

Question 35

The _______ is a heat resistance and is used in the aerospace and military technology.

Answer 35

PTE film capacitance

Question 36

non-polarized capacitors are classified in to two:

Answer 36

plastic foil capacitor and the electrolytic non-polarized capacitor

Question 37

non-polarized capacitor requires the ______

Answer 37

Ac applications in a series or parallel with a signal or power supply.

Question 38

(Type of capacitor) The examples are the speaker crossover filters and power factor correction network. In these two applications, a large AC voltage signal is applied across the capacitor

Answer 38

Non-Polarized Capacitor

Question 39

This capacitor uses ceramic material as dielectric.

Answer 39

Ceramic Capacitor

Question 40

one of the first materials used in the production of capacitors as an insulator.

Answer 40

ceramics

Question 41

The two common types of ceramic capacitors are ________ and _____

Answer 41

multilayer ceramic capacitor (MLCC) and ceramic disc capacitor.

Question 42

The multilayer ceramic capacitors are prepared by using the ______ technology and they are smaller in size, therefore, it used widely. While the ceramic disc capacitor is manufactured by _______ on both sides and to achieve larger capacitance, these devices are made from multiple layers.

Answer 42

surface mounted (SMD) coating a ceramic disc with silver contacts

Question 43

effect or the ability of a capacitor to store charges

Answer 43

CAPACITANCE

Question 44

capacitance is made up of two close conductors_______ and separated by the _____ material.

Answer 44

conductors; dielectric

Question 45

If the plates are connected to the power, then the plates accumulate the ______

Answer 45

Electric charge

Question 46

(C) of a capacitor is mathematically defined as

Answer 46

the ratio of the amount of charge (Q) in one plate to the potential difference (V) between the plates.

Question 47

one farad equals 1 ______

Answer 47

coulomb per volt.

Question 48

capacitance of a parallel plate capacitor is affected by the following factors:

Answer 48

a. Area of plates. The bigger the area of the plates, the greater is the capacitance. b. Distance between the plates. The closer the plates to one another, the greater the capacitance. c. Insulating material or dielectric between them.

Question 49

The dependence of the capacitance of a parallel plate capacitor on the factors cited above is mathematically expressed as

Answer 49

C=epsilon(A/d)

Question 50

Dielectrics serve three purposes:

Answer 50

1. To keep the conducting plates from coming in contact, allowing for smaller plate separations and therefore higher capacitances; 2. To increase the effective capacitance by reducing the electric field strength, which means you get the same charge at a lower voltage; and 3. To reduce the possibility of shorting out by sparking (dielectric breakdown) during operation at high voltage

Question 51

role of a dielectric inserted between the capacitor plates is to _________

Answer 51

impede or block the charges passing through the material

Question 52

Greater insulation of dielectric allows _____

Answer 52

more charges to be stored.

Question 53

Introducing a dielectric into a capacitor decreases the ________ which decreases the ____, which increases the ______

Answer 53

electric field, voltage capacitance.

Question 54

A capacitor with a dielectric store the same charge as one without a______, but a _______. Therefore, a capacitor with a dielectric in it is more effective.

Answer 54

dielectric; lower voltage;

Question 55

_______ is the work done in moving a unit positive charge from point A to point B in an electric field. Potential difference is designated as and is found by subtracting the potential at point A from the potential at point B.

Answer 55

Potential Difference

Question 56

If point A refers to the ground or infinity, the work done in bringing a unit positive charge from ground or infinity to another point B is called the _________ at point B.

Answer 56

electric potential

Question 57

unit of electric potential

Answer 57

volts (1 joule/coulomb J/C)

Question 58

who devised the first electric cells

Answer 58

Alessandro Volta

Question 59

On the other hand, if point A is not the ground nor the infinity, then the work done in moving a unit positive test charge from point A to point B is called the ___________

Answer 59

potential difference between points A and B.

Question 60

________ an actual consideration of the potentials in the circuit.

Answer 60

Potential difference is

Question 61

existence of Potential Difference also identifies ________

Answer 61

the flow of charges

Question 62

The amount of charge (Q) a capacitor can store depends on two major factors- the _____ applied and the capacitor’s _______, such as its size.

Answer 62

voltage; physical characteristics

Question 63

electric field strength (E) is directly proportional to the

Answer 63

charge

Question 64

Different capacitors will store different amounts of charge for the same applied voltage, depending on their )_____

Answer 64

physical characteristics.

Question 65

We define their capacitance (C) to be such that the charge (Q) stored in capacitor is ___________

Answer 65

proportional to (C). (Q=CV)

Question 66

There are three important rules for capacitors in series:

Answer 66

1) The reciprocal of the total capacitance is equal to the sum of the reciprocals of the individual capacitance 2) The total potential difference or total voltage is the sum of the potential differences across each capacitor. 3) The total charge is equal to the individual charge stored in each capacitor

Question 67

parallel capacitors, the following rules apply:

Answer 67

1. The total capacitance is the sum of the individual capacitances. 2. The voltage across all capacitors is equal to the voltage across each capacitor. 3. The total charge is equal to the sum of the individual charges. = 1 2 3