Need help with general math.

[Gala]

So, lets say the formula for power on a capacitor is:

Wc = 1/2 * C * U²

Its easy to calculate, easy to do.

But, HOW much is C when i have U and Wc? How do i get that formula?
How much is U when i have C and Wc?

Please help, im stuck, always on this stupid thing.

[olback]

LinusMathTips

[DIV1D3]

2Wc divided by U²

Just a matter of getting C on one side of the equation by itself. 

 

Edit:

Unless the 1/2 is only used with C and not C and U².

Then you would end up with 2Wc divided by 2U²

^{Just remember, what you do to one side of the equation, you must do the same to the other.} 

 

^Edit:

^{I'll put in a snip of a Word document so you have a visual representation and working.} 

[AlwaysFSX]

I'm an idiot and forgot about dividing fractions,@Nineshadow has it

[Gala]

2Wc divided by U²

Just a matter of getting C on one side of the equation by itself. 

 

Edit:

Unless the 1/2 is only used with C and not C and U².

Then you would end up with 2Wc divided by 2U²

^{Just remember, what you do to one side of the equation, you must do the same to the other.} 

And when i need U² then its 2Wc/C?

[Nineshadow]

It's so easy...

You just take the things you don't need to the other side.

Wc= 1/2 * c * u^2

Wc/(1/2*u^2) = c

WC/1/2 = 2WC

so :

2WC/u^2 = c

 

U = sqrt(2WC/C)

[Gala]

It's so easy...

You just take the things you don't need to the other side.

Wc= 1/2 * c * u^2

Wc/(1/2*u^2) = c

WC/1/2 = 2WC

so :

2WC/u^2 = c

 

U = sqrt(2WC/C)

Thank you so much! So much screwed up caclculations based on stupid formulas and me messing stuff up...

i luv u <33

[DIV1D3]

And when i need U² then its 2Wc/C?

Yes, but you'd have to square root the 2Wc/C to get the value of U, instead of U x U. 

Just like to ask, is the 'x 1/2' only for the C or the U² as well?

[Gala]

Yes, but you'd have to square root the 2Wc/C to get the value of U, instead of U x U. 

Just like to ask, is the 'x 1/2' only for the C or the U² as well?

1/2 is only for C

[DIV1D3]

-erm, I think I went full derp again-

Sorry I took so long, Imgur was being a derp. 

 

1/2 is only for C

Than it's all g, Idk why but I think I went full derp there, having the 1/2 with the C exclusively, or with both the C and U² wouldn't change anything lol. 

[Gala]

-erm, I think I went full derp again-

Sorry I took so long, Imgur was being a derp. 

 

Than it's all g, Idk why but I think I went full derp there, having the 1/2 with the C exclusively, or with both the C and U² wouldn't change anything lol. 

Derping is awsome yeha lol

Thanks again!