Capacitors (4 of 9) Calculating the Capacitance of a Capacitor, An Explanation

Explains how to calculate the capacitance of a capacitor.
A capacitor is a passive electronic device that stores electric charge on its plates and electrical energy in its electric field. A capacitor contains at least two electrical conductors such as metal plates that are separated by a dielectric. The insulating dielectric acts to keep the metal plates isolated from each other and to increase the capacitor's ability to store charge. Materials commonly used as dielectrics include glass, ceramic, plastic film, paper, mica and air. Unlike a resistor, an ideal capacitor does not dissipate energy. The SI unit of capacitance is the farad (F), which is defined as one coulomb per volt (1 C/V).
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[@milkshika4034]

You just saved my life with this, thank you so much!

[@ruthfabian6729]

Watching it after 8 years of upload
Thanks it was really helpful

[@stepbystepscience]

You're very welcome! Glad it was helpful

[@spicyriirii7879]

This was very helpful .Thank you for making it so easy to understand :)

[@jasonsumair9725]

thx bro
This help for my Instrumentation studies, I worked them out perfectly now. Whoa!!!!!

[@gualbertoporteladarosa8802]

Quick question: how do you cancel the units to derive to Farads?

[@mrgreenswelding2853]

How do i calculate what size capacitor i need to run an electric motor?

[@originalCN4]

I’ve literally forgot most of this, thank you for the refresher

[@stepbystepscience]

Glad it was helpful!

[@gilbreathca]

Question about the plate area... In an open-air variable butterfly capacitor, is this the TOTAL surface area of the rotor AND the stator? Both sides of all plates? Is it just the rotor? Just the Stator?

[@shawnfanning8519]

Great job

[@alliahmaebenavidez7129]

Well Explained! Thank you!

[@stepbystepscience]

Glad you think so. You're welcome!

[@maliknaveedislam]

I have a question to ask, for 48v, 3Kw DC motor I wanna make a backup capacitors pack, when I switch from one line of electricity to another, in that moment I don’t want to stop motor during switching, for that purpose how many caps, how many capacitors in pack required?

[@padinclliyr_sci6398]

Thank you, this video of yours is a big help for me

[@stepbystepscience]

Glad to hear that and thanks for watching!

[@alaa7783]

Thank you for a great explanation

[@stepbystepscience]

Most welcome

[@danijanegonzales6680]

6:50 Can we put any value for K ? For example Bakelite has 3.5-5.0 dielectric constant. What is your basis why does you choose 4.7, in between of 3.5 - 5.0.

[@IdrisNadel]

Was helpful, thanx.

[@stepbystepscience]

You are very welcome.

[@tronimaster1339]

Thanks for explaining

[@stepbystepscience]

You're welcome and best wishes

[@mouricewanjala1024]

Excellent!!!

[@stepbystepscience]

Many thanks!

[@notmerom9145]

how to the area formula using the capacitance formula?

[@jalp-km4rn]

sana all !!!!!!!!!!!!!!!!!!!!

[@achilesthegreatwarrior9933]

this is very helpful.

[@stepbystepscience]

Glad it helped you, thanks for the comment!

[@dreamofomkar]

Nice video sir...
Love from india..

[@stepbystepscience]

Thanks for the support from Berlin, Germany.

[@tahmid61]

can you explain please premitivity of free space 8.85×10-12, I do not understand C2/NM2. what will be the number for c2 and Newton and m 2?

[@stepbystepscience]

There are no numbers for the c^2 and the m^2. That is just the units for the constant.

[@GibsonSimonSom]

really helpful.

[@stepbystepscience]

Glad you think so, thanks!

[@milans2176]

6:57 why dont we multiply the area times 2? we have 2 plates why should only one area be considered?

[@MM-zd7vk]

Co ask, I need help with this did you manage to get it

[@milans2176]

@@MM-zd7vk you have to use the smallest plate and since you have 2 identical plates you just use one.

[@MM-zd7vk]

@@milans2176 thank you so much

[@mixmusic679]

Very helpfull

[@stepbystepscience]

Glad to hear that, thanks!

[@sumankabi9496]

Excellent teaching short n clear !! Please share a video on how can we know how much capacitance /size needed for each different circuit?

[@Kknhg]

Thanks 👍

[@stepbystepscience]

Welcome 👍

[@IsabelDelgado]

thanks !

[@stepbystepscience]

Welcome!

[@nanakwadwofordjourbright2131]

About the area. Is it the cross sectional area or just the area of one surface

[@stepbystepscience]

It is the surface area of one of the plates.

[@ramsgallo5151]

Is there a problem that needs to find the separation? If so, please tell me how to find the distance with given. If not, tell me why its not possible.

[@stepbystepscience]

You can calculate the distance by rearranging the equation:
d = kEA/C

[@ramsgallo5151]

@@stepbystepscience Thank you for answering! My initial thought is also the same as yours. But how do I rearrange this equation?
How do I rearrange the formula to find the distance from the original formula C = kEA/d?

[@rocketkinger2506]

love you

[@stepbystepscience]

The feeling is mutual. Thanks for the comment.

[@besteebox5894]

Design on MPP film

[@andyocran2049]

Thanks

[@stepbystepscience]

Welcome

[@fabiyinurudeen7286]

Nice

[@stepbystepscience]

Thanks

[@brrrr2106]

hey i hope u can response asap thank u, may i ask. the first problem, the distance was in a scientific notation form, but in the 2nd one, it was now the area which was in scientific notation, how did that happened? hope u can still response thank u so much i just needed it asap (sorry for my bad english)

[@stepbystepscience]

If does not matter what form the values are in, scientific or standard form, you just have to put the correct number in. First of all you have to convert to meters because that is the base unit for length in the metric system and the constant has its unit in meters, but I in the first problem I could have used 0.00215 m instead of 2.15 x 10^-3. It is the same thing.
In the second problem I could have put 0.005 m in for the area because it is the something as 5.0 x10^-3 m. They are both the same. Does that help?

[@brrrr2106]

@@stepbystepscience OMG THANK YOU FOR THE EXPLANATION. Now I understand it much better, this really helps me a lot, have a good day, thank you again!!!

[@chasidgoodmaker1804]

What about voltage?

[@stepbystepscience]

what about it?

[@shaneroper5470]

Free space...... in actuality it's called the Aether.

[@ponkiebonk]

are you c3po by any chance?

[@stepbystepscience]

I am a droid but not C3PO, more like K-2SO.

[@MukongNolet-zp6lx]

Very explicit

[@stepbystepscience]

Thanks

[@muhanad9007]

add another video

[@stepbystepscience]

About what? Capacitance or something else?

[@jyamijuice9100]

I think I love u

[@stepbystepscience]

That's nice, thanks for the compliment.
You can see a listing of all my videos at my website: www.stepbystepscience.com

[@jyamijuice9100]

You explain every formula as if the person watching has never done physics, I've been having issues in first year engineering as they dont explain what everything is in the formula as they assume we have done physics in yr 12 and these vids have saved my butt

[@stepbystepscience]

Thanks again, I try to go over just what you need step-by-step with out any extra talking. I hope the engineering goes well. Keep your head up and work hard, it will come. Where are you studying? My son starts engineering this year at Southampton in England. We are currently living in Berlin Germany.

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Are you aware that you sound like Tony Stark?

[@stepbystepscience]

No, moslty people say I sound like Vince Vaugh, Tom Hanks or Vin Diesel.

[@ibidunvictor5303]

Great job

[@stepbystepscience]

Thanks

[@mj_05]

Thanks 👍

[@stepbystepscience]

Welcome!