Energy stored before and after in the capacitor

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Discussion Overview

The discussion revolves around a homework problem involving the calculation of energy stored in capacitors before and after they are connected. The scenario includes a 1 microfarad capacitor charged to 20V and a 2 microfarad capacitor charged to 16V. Participants explore the relevant formulas and concepts related to capacitor energy storage.

Discussion Character

  • Homework-related, Technical explanation

Main Points Raised

  • One participant asks for help with calculating the energy stored in two capacitors before and after they are connected.
  • Another participant suggests that the first step is to identify the formula for the energy stored in a capacitor, prompting the original poster to show their progress.
  • A participant provides the formula for energy stored in a capacitor as W = 1/2 C V, indicating their understanding of the concept.
  • Another participant challenges the understanding of the original poster by stating that CV represents the charge of a capacitor, suggesting a need for further study.

Areas of Agreement / Disagreement

The discussion shows some agreement on the formula for energy storage in capacitors, but there is disagreement regarding the understanding of the relationship between charge and energy, indicating a lack of consensus on the foundational concepts.

Contextual Notes

Participants have not yet resolved the calculations or clarified the implications of connecting the capacitors, leaving some assumptions and steps in the problem unaddressed.

Ankitshyani
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Homework Statement



A 1microf capacitor is charged to 20V and is connected in parallel to a 2microf capacitor charged to 16V. how much energy is stored before and after connection?

please anyone can help me with this problem
Thanks in advance

Homework Equations





The Attempt at a Solution

 
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Welcome to PF!

Hi Ankitshyani! Welcome to PF! :wink:

(have a mu: µ :wink:)

What is the usual formula for energy of a capacitor?

Show us how far you get, and where you're stuck, and then we'll know how to help! :smile:
 
hi there,

how are you...the formula for energy stored in the capacitor is: W = 1/2 C V ...

thanksss
 
Ankitshyani said:
hi there,

how are you...the formula for energy stored in the capacitor is: W = 1/2 C V ...

thanksss

No, CV is the charge of a capacitor …

go back to your book and study it again. :wink:
 

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