CrazyEngineers Archive
Old, but evergreen and popular discussions on CrazyEngineers, presented to you in read-only mode.
@rohit bisht • 30 Mar, 2010
why we use capacitor in place of inductor in electronics circuits..??
@lal • 31 Mar, 2010 Is it like that?
May be because, dc cannot induce back emf since it is steady and so will not give the desired result.
@Saandeep Sreerambatla • 31 Mar, 2010
rohit bisht
why we use capacitor in place of inductor in electronics circuits..??
IS it?
Can you give an example? Where capacitor in place of inductor?

Since both have its own usage.
@rohit bisht • 31 Mar, 2010 ok..i mean at the output,,mostly..we use capacitor,.?why nt inductor?
@cooltwins • 31 Mar, 2010 we mostly use a capacitor at output so as to remove the dc components that may be included in the output. the dc component is undesirable as say for example in a ac component regulator the dc component can cause the distortion of the output wave and cause limitations in the maximum voltage swing possible.

correct me if i am wrong.
@lal • 31 Mar, 2010
rohit bisht
ok..i mean at the output, mostly..we use capacitor..?why nt inductor?
A capcitor and inductor has its own special functions. An inductor can block AC component and pass DC. But the capacitor does the exact opposite that it passes AC and blocks DC.

So, they are used according to the necessity. We use capacitors at output to block the undesired DC component. An example is amplifier output.
You might have seen inductor filters to block AC in a rectified output.

So it doesn't mean we use only capacitors in electronic circuits.
@Saandeep Sreerambatla • 01 Apr, 2010 Yeah , the question is confusing!
We use both in electric circuits to get the desired output!
As said above we use capacitor to remove the undesired DC components. More over in transmission systems we use capacitors at the end of the line to improve the power factor of the generated power!
As the power is transmitted to long distances we get lot of losses including corona, and many more!
SO to improve the output power and power factor we use capacitors.
@Roderick • 01 Apr, 2010 A capacitor is made up of two metal surfaces that face each other but are insulated from one another. The big thing to understand about Capacitors and Inductors in DC Circuits is that they have a transient (temporary) response. During the transient period, capacitors build up charge and stop the flow of current (eventually acting like infinite resistors.) Inductors build up energy in the form of magnetic fields, and become more conductive. other words, in the steady-state (long term behavior), capacitors become open circuits and inductors become short circuits.

east london electrician
@rohit bisht • 01 Apr, 2010
cooltwins
we mostly use a capacitor at output so as to remove the dc components that may be included in the output. the dc component is undesirable as say for example in a ac component regulator the dc component can cause the distortion of the output wave and cause limitations in the maximum voltage swing possible.

correct me if i am wrong.
thanks ..i do agree wid you..
@prat_22 • 26 Apr, 2010
rohit bisht
why we use capacitor in place of inductor in electronics circuits..??
Now, the question you have asked, is meaningless without an example circuit. Since capacitors and inductors have their own responsibilities in a circuit, it is not possible to answer your question without a valid circuit diagram. Post a ckt., and then we can surely discuss the use of each elements in it.
@Mr.Don • 28 Apr, 2010 Its based upon the output we had to obtain but capacitor is preferred where we need to get AC output and to eliminate distortions due to DC components.
@invincible hunk • 23 May, 2010
rohit bisht
why we use capacitor in place of inductor in electronics circuits..??
its because when we need less time constant for the circuits, the capacitance value should be less and the inductance more... more inductance lead to bulky circuits..but capacitors are not bulky. so we use capacitors only.
@senthamil_arasu • 24 May, 2010 we can use capacitor to block ac as well as dc.it blocks dc when it is connected in series with the line . and it grounds ac and allows when it is connected in shunt to the ground ..

think am right . correct if am wrong .. thnx
@invincible hunk • 24 May, 2010
senthamil_arasu
we can use capacitor to block ac as well as dc.it blocks dc when it is connected in series with the line . and it grounds ac and allows when it is connected in shunt to the ground ..

think am right . correct if am wrong .. thnx
yes. you are right.. but the same properties can be performed by inductor also. so that's not the real reason why we don't use inductor(its because inductors are more bulky!!)
@senthamil_arasu • 24 May, 2010 ya . thats rignt , and some other factors are power dissipation , and impedance matching ,, were it affects .

think so am correct , correct me if am wrong
@niharikabhatt • 01 Jun, 2010 At very high frequncies we can replace an inductor by a capacitor as the signal will be almost a dc,so we need not have an inductor to block the ac component.
I am not sure though if as rohit says the two can be interchanged all the time.It may depend from circuit to circuit and our necessity.I mean,if they wre replceable why would we have two things-C and L. We wuld hav had one thing,isnt it?
@Parual Datta • 13 Apr, 2015
rohit bisht
why we use capacitor in place of inductor in electronics circuits..??
Inductor is bulky,weighty,expensive and causes ohmic loss as compare to capacitor.Besides, inductor is noisy in nature.That's why we are using capacitor in place of inductor.
@duraipandy.R • 13 Apr, 2015
rohit bisht
why we use capacitor in place of inductor in electronics circuits..??
to limiting the current
@Mr.whatever • 01 May, 2015 Role of every electronic device is different according to its application.if its a inductor it can use to smooth the current,limit di/dt,energy storage element etc.capacitor also used to maintain dc link voltage constant,reduce dv/dt or as a energy storage. So without defining application or circuit diagram there is no any perfect answer for why its there.but only conclusion i can get from your question is in electronic we mostly deal with dc nd in dc inductor just act as a short circuit so may be cap is used to limit the current if there is availablity of discharge path for the capacitor.
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