Energy stored before and after in the capacitor

In summary, the conversation was about a problem involving two capacitors, one charged to 20V and the other to 16V, connected in parallel. The question was how much energy is stored before and after the connection. The formula for energy of a capacitor was mentioned, but the correct formula was later clarified.
  • #1
Ankitshyani
2
0

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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  • #2
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:
 
  • #3
hi there,

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

thanksss
 
  • #4
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:
 

1. What is a capacitor?

A capacitor is an electrical component that is used to store energy in the form of an electric field. It is made up of two conductive plates separated by an insulating material called a dielectric.

2. How is energy stored in a capacitor?

When a voltage is applied to a capacitor, one plate becomes positively charged and the other becomes negatively charged. This creates an electric field between the plates, which stores the energy.

3. What is the equation for calculating the energy stored in a capacitor?

The energy stored in a capacitor can be calculated using the equation E = 1/2CV², where E is the energy in joules, C is the capacitance in farads, and V is the voltage in volts.

4. Does the energy stored in a capacitor change before and after charging?

Yes, the energy stored in a capacitor changes before and after charging. Before charging, the capacitor has no stored energy as the plates have equal and opposite charges. After charging, the capacitor has stored energy in the form of an electric field between the plates.

5. How does the energy stored in a capacitor affect its performance in an electrical circuit?

The energy stored in a capacitor affects its performance in an electrical circuit by providing a temporary source of power when needed. It can also affect the rate at which the capacitor can discharge energy, which can impact the overall functioning of the circuit.

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