Class 12 Exam > Class 12 Videos > How capacitor Works
How capacitor Works Video Lecture - Class 12
FAQs on How capacitor Works Video Lecture - Class 12
| 1. How does a capacitor work? |  |
Ans. A capacitor works by storing electrical energy in an electric field. It consists of two conductive plates separated by an insulating material called a dielectric. When a voltage is applied across the plates, positive charge accumulates on one plate, while an equal amount of negative charge accumulates on the other plate. This separation of charge creates an electric field between the plates, storing electrical energy.
| 2. What is the purpose of a capacitor in a circuit? | |
Ans. The purpose of a capacitor in a circuit is to store and release electrical energy. It can be used in various ways, such as smoothing out voltage fluctuations, filtering out certain frequencies, and blocking direct current while allowing alternating current to pass. Capacitors are also commonly used in timing circuits, energy storage systems, and as a component in electronic filters.
| 3. How does the capacitance of a capacitor affect its performance? | |
Ans. The capacitance of a capacitor determines its ability to store electrical energy. A higher capacitance value means the capacitor can store more charge and therefore more energy. It affects the performance of a capacitor in terms of its ability to hold a charge, discharge rate, and the frequency at which it can store or release energy. Higher capacitance capacitors are used for applications requiring larger amounts of stored energy.
| 4. What factors affect the capacitance of a capacitor? | |
Ans. Several factors affect the capacitance of a capacitor. The most significant factors include the surface area of the plates, the distance between the plates, and the type of dielectric material used. Increasing the surface area of the plates or decreasing the distance between them increases the capacitance. Additionally, using a dielectric material with a higher permittivity increases the capacitance of a capacitor.
| 5. Can a capacitor store DC (direct current) or only AC (alternating current)? | |
Ans. A capacitor can store both DC and AC. However, it behaves differently with each type of current. For DC, a capacitor charges up to the applied voltage and holds that charge until discharged. In AC circuits, the capacitor alternately charges and discharges as the polarity of the voltage changes. Capacitors are often used in circuits that require the storage or blocking of specific types of currents, depending on their intended application.
Text Transcript from Video
hello friends this video on capacitors
and capacitance part 6 is brought to you
by exam feel calm no more fear from exam
please make sure that you have watched
all the videos till part 5 before going
ahead with part 6 now it is time to see
how does a capacitor basically works now
we still remember the construction of
the capacitor it will consists of two
conductors as I already mentioned that
the capacitor basically consists of two
conductors will riveted by an insulating
so let us suppose this is one conductor
so let us suppose we bring this
conductor it is named this as conducted
T so from some source we give some
amount of charge to this conductor and
we keep giving charge to this and FL let
us say we keep increasing the amount of
charge to this conductor until and
unless its potential reaches a maximum
later suppose we are supplying some
charge to disconnected Q amount of
charge is given to this thing conducted
till it reached its maximum potential so
let us suppose it reached its maximum
potential say some V now what do I do I
bring another conductor in front of this
conductor similar to this let us call
this as conductive V so since I was
giving supplying some positive charge Q
so this due to this positive charge
negative charge will get induced in
conductor V we discussed this when we
talked about charging by induction
right so when this conductor comes in
front of conductor a because of this
positive charge at this end negative
charge will get induced in the near and
end of B right now see if this end is
negative then all the positive charges
will accumulate at this end right now
word would be the as I told you II was
at its maximum potential B
maximum potential V before B arrived now
when we arrived what will happen to the
potential of a data suppose I earlier it
was a potential B now because of this
negative charges at this end what will
happen this potential will decrease the
potential will decrease due to the
negative charges why would it decrease
we discussed all these things in our
potential process right because earlier
the potential was V and now the
potential due to the negative charges
would be nothing but K Q by AI minus KQ
by a friend so the your potential got
reduced by this amount now similarly the
potential at a will increase because of
these positive charges because in that
case the potential will increase by this
amount
so the potential will increase because
of the positive charges so there are two
things happening the potential that was
the maximum potential and increase
because of the negative charges it can
it sorry it can decrease because of the
negative charges and it can increase
because of these positive charges now
just have a look
which of these two are nearer to plate a
obviously the negative charges since the
negative charges are nearer so the
effect of negative charges will be more
so that means the potential V of a will
basically reduce now as the potential
reduces so there comes more space to
give more charge because it still have
some space to reach the maximum
potential now what I do is to reduce the
potential further so that I can give and
or I can supply more and more charge to
the plate a what do I do
I earth this conductor B now if I are
this conductor B what happens all this
excess of positive charge at this end
gets earth right so this positive
charges vanish now once this positive
charges vanish there is no effect of
increase of potential due to the
positive charges right therefore the
decrease of potential is even
so now the potential decreases aldermore
and the more the potential decreases the
more is the scope of supplying more and
more charge to creating so what are we
basically doing basically with this
arrangement we are making more space on
the conductor a to get more and more
charge so that we are supplying more and
more charge and hence greater charge is
getting stored in this arrangement of
two conductors okay so this is how a
capacitor can store charge in a small
space so high amount of charge within a
small space so we will quickly review it
once again what did how is this
arrangement working first consider the
first plate first conductor rather let's
suppose from some source you are at
supplying some charge some positive
charge say Q to this conductor and you
keep applying this charge until and
unless it reaches its maximum possible
potential now when it is at its maximum
potential you bring another conductor in
front of a so due to induction of
charges negative charges get induced to
the near end and positive charges get
induced and to the farther end now
because of the negative charges the
potential of a decreases whereas because
of the positive charges the potential of
a increases now why do I do since the
negative charges are needed the effect
of negative charges here is stronger
therefore the net potential of a
decreases because of the presence of
this conductor B now in order to further
reduce potential what do we do we earth
the positive charges to the ground so
that the change in or so that the
decrease in potential becomes all the
more so as a result the potential
decreases and more space is created for
taking in more and more charge and that
is how the capacitor is able to store
huge amount of charge within a small
space so this is the this is how any
basic capacitor works now we have
different categories of capacitor which
have different construction and
depending upon that they work in their
own
but the basic principle still remains
the same thank you please visit exam
viacom to watch free educational videos
try free online tests get the best
quality study materials study from the
best tutors and mentors and much moon
thank you once again
and capacitance part 6 is brought to you
by exam feel calm no more fear from exam
please make sure that you have watched
all the videos till part 5 before going
ahead with part 6 now it is time to see
how does a capacitor basically works now
we still remember the construction of
the capacitor it will consists of two
conductors as I already mentioned that
the capacitor basically consists of two
conductors will riveted by an insulating
so let us suppose this is one conductor
so let us suppose we bring this
conductor it is named this as conducted
T so from some source we give some
amount of charge to this conductor and
we keep giving charge to this and FL let
us say we keep increasing the amount of
charge to this conductor until and
unless its potential reaches a maximum
later suppose we are supplying some
charge to disconnected Q amount of
charge is given to this thing conducted
till it reached its maximum potential so
let us suppose it reached its maximum
potential say some V now what do I do I
bring another conductor in front of this
conductor similar to this let us call
this as conductive V so since I was
giving supplying some positive charge Q
so this due to this positive charge
negative charge will get induced in
conductor V we discussed this when we
talked about charging by induction
right so when this conductor comes in
front of conductor a because of this
positive charge at this end negative
charge will get induced in the near and
end of B right now see if this end is
negative then all the positive charges
will accumulate at this end right now
word would be the as I told you II was
at its maximum potential B
maximum potential V before B arrived now
when we arrived what will happen to the
potential of a data suppose I earlier it
was a potential B now because of this
negative charges at this end what will
happen this potential will decrease the
potential will decrease due to the
negative charges why would it decrease
we discussed all these things in our
potential process right because earlier
the potential was V and now the
potential due to the negative charges
would be nothing but K Q by AI minus KQ
by a friend so the your potential got
reduced by this amount now similarly the
potential at a will increase because of
these positive charges because in that
case the potential will increase by this
amount
so the potential will increase because
of the positive charges so there are two
things happening the potential that was
the maximum potential and increase
because of the negative charges it can
it sorry it can decrease because of the
negative charges and it can increase
because of these positive charges now
just have a look
which of these two are nearer to plate a
obviously the negative charges since the
negative charges are nearer so the
effect of negative charges will be more
so that means the potential V of a will
basically reduce now as the potential
reduces so there comes more space to
give more charge because it still have
some space to reach the maximum
potential now what I do is to reduce the
potential further so that I can give and
or I can supply more and more charge to
the plate a what do I do
I earth this conductor B now if I are
this conductor B what happens all this
excess of positive charge at this end
gets earth right so this positive
charges vanish now once this positive
charges vanish there is no effect of
increase of potential due to the
positive charges right therefore the
decrease of potential is even
so now the potential decreases aldermore
and the more the potential decreases the
more is the scope of supplying more and
more charge to creating so what are we
basically doing basically with this
arrangement we are making more space on
the conductor a to get more and more
charge so that we are supplying more and
more charge and hence greater charge is
getting stored in this arrangement of
two conductors okay so this is how a
capacitor can store charge in a small
space so high amount of charge within a
small space so we will quickly review it
once again what did how is this
arrangement working first consider the
first plate first conductor rather let's
suppose from some source you are at
supplying some charge some positive
charge say Q to this conductor and you
keep applying this charge until and
unless it reaches its maximum possible
potential now when it is at its maximum
potential you bring another conductor in
front of a so due to induction of
charges negative charges get induced to
the near end and positive charges get
induced and to the farther end now
because of the negative charges the
potential of a decreases whereas because
of the positive charges the potential of
a increases now why do I do since the
negative charges are needed the effect
of negative charges here is stronger
therefore the net potential of a
decreases because of the presence of
this conductor B now in order to further
reduce potential what do we do we earth
the positive charges to the ground so
that the change in or so that the
decrease in potential becomes all the
more so as a result the potential
decreases and more space is created for
taking in more and more charge and that
is how the capacitor is able to store
huge amount of charge within a small
space so this is the this is how any
basic capacitor works now we have
different categories of capacitor which
have different construction and
depending upon that they work in their
own
but the basic principle still remains
the same thank you please visit exam
viacom to watch free educational videos
try free online tests get the best
quality study materials study from the
best tutors and mentors and much moon
thank you once again
Related Exams
About this Video
|
Nov 24, 2024 Last updated |
How capacitor Works for Class 122024 is part of Class 12 preparation. The notes and questions for How capacitor Works
have been prepared according to the Class 12 exam syllabus. Information about How capacitor Works covers all important topics
for Class 122024 Exam. Find important definitions, questions, notes, meanings, examples, exercises
and tests below for How capacitor Works.
Description
Video Lecture & Questions for How capacitor Works Video Lecture - Class 12 - Class 12 full syllabus preparation | Free video for Class 12 exam.
Information about How capacitor Works
Here you can find the How capacitor Works defined & explained in the simplest way possible. Besides explaining types of How capacitor Works
theory, EduRev gives you an ample number of questions to practice How capacitor Works tests, examples and also practice Class 12 tests.
|
Explore Courses for Class 12 exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
Related Searches
How capacitor Works Video Lecture - Class 12
,Sample Paper
,How capacitor Works Video Lecture - Class 12
,Viva Questions
,MCQs
,Important questions
,video lectures
,How capacitor Works Video Lecture - Class 12
,Objective type Questions
,Semester Notes
,Exam
,Summary
,ppt
,past year papers
,study material
,Previous Year Questions with Solutions
,Free
,mock tests for examination
,practice quizzes
,shortcuts and tricks
,Extra Questions
;
Study How capacitor Works on the App
Students of Class 12 can study How capacitor Works alongwith tests & analysis from the EduRev app,
which will help them while preparing for their exam. Apart from the How capacitor Works,
students can also utilize the EduRev App for other study materials such as previous year question papers, syllabus, important questions, etc.
The EduRev App will make your learning easier as you can access it from anywhere you want.
The content of How capacitor Works is prepared as per the latest Class 12 syllabus.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup