Physics - E&M: Ch 39.2 Capacitors & Capacitance Understood (8 of 27) Energy Stored on a Capacitor

Visit ilectureonline.com for more math and science lectures!
In this video I will explain the energy store on a capacitor which is dependent on the number of charges stored on a capacitor.
Next video in this series can be seen at:
• Physics - E&M: Ch 39.2...

[@tseckwr3783]

Thanks again. Your lectures are always a great review for me.

[@WonderboyWonderboy-zi1dt]

Is there another way to consider the 1/2 you placed in the equation? My book used integration, which is how they arrived at the 1/2.

[@Jose-ob7pc]

On your earlier video you said C= Ke.(A/d). I know that K is not coulomb constant, but this might confuse some. K, in this case, is a dielectric constant which is in most cases 1

[@MichelvanBiezen]

As in all of physics, the letters of the alphabet are used multiple time for different constants, definitions, and meanings. Since this equation is used to find the capacitance of a physical capacitor, K is the dielectric constant. K is only 1 when there is a vacuum in between the plates. For all other dielectrics it is greater than one.

[@ahmadkhattab3560]

Your videos are so helpful :)

[@MichelvanBiezen]

Glad you like them!

[@ahmadkhattab3560]

@@MichelvanBiezen Btw I'm a physics teacher and I recommend your videos to undergraduates 👏

[@ahmedal-ebrashy3691]

What is big Q and what is small q, thank you?

[@teddy619]

Brilliant

[@cristyhagi1987]

sir why we use 1/2 in that equation?

[@MichelvanBiezen]

The 1/2 represents the average work done to move the first charge and the last charge. (It takes no work to move the first charge and the maximum amount of work to move the last charge) (Average = 1/2)

[@vishwajeetkumar5312]

Positive charge never flow but here on pushing how positive charge flow from plate to battery

[@MichelvanBiezen]

It is a theoretical concept and it became the convention. (In actuality it is the electrons that are moving). But most text books and professors (as well as engineers) will hold themselves to the convention of positive current.

[@vishwajeetkumar5312]

Thanks ,your lecture explanation is great

[@용구탱글]

Why the C equation not have k,in the previous video there's a k.

[@MichelvanBiezen]

I did not see a "k" in the previous video, but this may help: k = 1 / (4 x pi x Eo)

[@mudassirgulzar5030]

Why have your subscribers decreased?they were around300k

[@MichelvanBiezen]

No we haven't reached 300K.

[@htopcu250]

probably midterms passed over lol

[@harlbertmayerh7523]

It's so funny that he sounds like a human voice lol
*WAIT*