How many electrons on a Capacitor calculation

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  • Thread starter ENE
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  • #1
ENE
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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?????
 

Answers and Replies

  • #2
Drakkith
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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.
 
  • #3
ENE
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Thanks.

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

rc2.gif
 
  • #5
ENE
42
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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


tcons.gif



voltage across the capacitor
how we get exponential here?
rc15.gif
 
  • #6
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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.
 
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  • #7
ENE
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i have to learn this equation?
 
  • #8
Vanadium 50
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i have to learn this equation?
Oh, the horror! The horror!

Yes, you have to learn it.
 
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  • #9
ENE
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in electrical engineering how man equation are there?
 
  • #10
jtbell
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voltage across the capacitor
how we get exponential here?
proxy.php?image=http%3A%2F%2Fwww.electronics-tutorials.ws%2Frc%2Frc15.gif
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.
 
  • #11
ENE
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Hello,
Why The sum of the voltage drops∆Vi , across any circuit elements that form a closed circuit is zero.??
 
  • #12
ProfuselyQuarky
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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 :woot:
 
  • #13
Drakkith
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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.
 
  • #14
nasu
Gold Member
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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?
 

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