Finding Energy Stored in a Capacitor

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    Capacitor Energy
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Homework Help Overview

The discussion revolves around finding the energy stored in a capacitor in steady state within a circuit. Participants are exploring the relationship between charge, capacitance, and energy storage in capacitors.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the use of the formula for energy stored in a capacitor, specifically U = (Q^2)/2C, and question its validity when applied to their calculations. There is also inquiry into the expression for energy in terms of capacitance and voltage.

Discussion Status

Some participants have provided guidance by suggesting that the original poster needs to show their work for better assistance. There is an ongoing exploration of different expressions for energy and the implications of using charge versus voltage in calculations.

Contextual Notes

Participants note that the charge on the capacitor in steady state is known, yet there is uncertainty about why the initial method yields incorrect results. There is an emphasis on the need for clarity in the calculations presented.

le@rner
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Homework Statement



How to find the energy stored in the capacitor in steady state in this circuit.

IMG_20160108_210548_HDR.jpg


Homework Equations

The Attempt at a Solution


I found out the charge on the capacitor in steady state using loop law and did energy stored = (Q^2)/2C. but its coming out to be incorrect.
 
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le@rner said:

Homework Statement



How to find the energy stored in the capacitor in steady state in this circuit.

View attachment 94102

Homework Equations

The Attempt at a Solution


I found out the charge on the capacitor in steady state using loop law and did energy stored = (Q^2)/2C. but its coming out to be incorrect.
What is the expression for energy in terms of C and V? In steady state, voltage and capacitance will be known to you.
 
cnh1995 said:
What is the expression for energy in terms of C and V? In steady state, voltage and capacitance will be known to you.

But we also know the charge on the capacitor in steady state. Don't we?
Then why is it coming incorrect using this method.
 
le@rner said:

Homework Statement


How to find the energy stored in the capacitor in steady state in this circuit.
View attachment 94102

Homework Equations



The Attempt at a Solution


I found out the charge on the capacitor in steady state using loop law and did energy stored = (Q^2)/2C. but its coming out to be incorrect.
You need to show your work. We can't say much about what you did wrong if we don't know what you did.
 
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