# What is the energy stored in the capacitor for dc operation?

Discussion in 'Homework Help' started by hsilver, Sep 6, 2016.

Sep 6, 2016
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2. ### AlbertHall Well-Known Member

Jun 4, 2014
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Have you calculated any voltages in that circuit?

3. ### MrAl Distinguished Member

Jun 17, 2014
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Hi there,

Yeah good idea. Calculate the voltage across the cap and then you can calculate the energy from just that.

4. ### crutschow Expert

Mar 14, 2008
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3,361
Do you know the equation for the energy stored on a capacitor versus its voltage?

5. ### hsilver Thread Starter New Member

Sep 6, 2016
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I found the thevenin equivalent circuit across the capacitor (I am assuming that I did it right), but I dont know how to calculate the energy stored. My Vth = 8.57V and Rth = 2.14 ohms

6. ### crutschow Expert

Mar 14, 2008
13,475
3,361
Here's some info on that.

7. ### dannyf Well-Known Member

Sep 13, 2015
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all you need is to get the voltage over the 6R resistor.

To do that, do a conversion of 8v+2ohm into a 4amp//2ohm current source. Everything is elementary after that.