How many electrons on a Capacitor calculation

[ENE]

Hello,
How to find number of electronics in capacitor?
as 1 coulomb and 1 Amp has 6.25x10^18
on what they depend?
Is this correct..?
Q=C*V
C=47uF and V=12V
Q=47*10^-6*12=5.64*10^-4 Coulmb?

 

[Drakkith]

How to find number of electronics in capacitor?

The number of electrons in a capacitor is given by Q=CV, which you've calculated correctly.

 

[ENE]

Thanks.

I don't understand this graph
How the capacitor will charge with series Resistance?

 

[Drakkith]

See here: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/capchg.html

 

[ENE]

Hello,
I got
a. The rate of charging is typically described in terms of a time constant RC.
b. The electrical transient phenomena in capacitors and inductors are exponential processes

voltage across the capacitor
how we get exponential here?

 

[fizzle]

The voltage on a capacitor is Vc = Q / C.

Note: you copied images from two different circuit explanations and that's causing confusion. The "Vb" in the first image is "Vs" in the second image.

 

[ENE]

i have to learn this equation?

 

[Vanadium 50]

i have to learn this equation?

Oh, the horror! The horror!

Yes, you have to learn it.

 

[ENE]

in electrical engineering how man equation are there?

 

[jtbell]

voltage across the capacitor
how we get exponential here?

We solve the differential equation for the circuit. See for example

http://web.mit.edu/molly/Public/circuits-b.pdf

and scroll down to page W6-6. This uses Q as the variable, not V, but you can change variables using Q = CV if you prefer.

 

[ENE]

Hello,
Why The sum of the voltage drops∆Vi , across any circuit elements that form a closed circuit is zero.??

 

[ProfuselyQuarky]

The voltage on a capacitor is Vc = Q / C.

Oh, the horror! The horror!

Yes, you have to learn it.

ENE, that's an awfully basic equation, you needn't worry

 

[Drakkith]

Hello,
Why The sum of the voltage drops∆Vi , across any circuit elements that form a closed circuit is zero.??

The answer to this is kind of in-depth and I don't feel you're ready for it at the moment.

 

[nasu]

Hello,
Why The sum of the voltage drops∆Vi , across any circuit elements that form a closed circuit is zero.??

The static electric field is a conservative field. So the work done on a closed path is zero.
Do you understand the relationship between work and potential difference?