Capacitor separated by a dielectric

In summary, the conversation is about a discrepancy with the calculation of the maximum energy that can be stored in a capacitor. The person is confused about why multiplying the maximum voltage by the maximum charge is incorrect. Another person explains that this calculation is incorrect because as charge is drawn off, the capacitor voltage decreases, so the maximum charge is not available at the maximum voltage.
  • #1
EngineerHead
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0

Homework Statement



REFER TO ATTACHED SCREEN SHOT

Homework Equations


The Attempt at a Solution



My discrepancy is with the last question labeled "Exercise" (What is the maximum energy that can be stored in the capacitor?).

Since the max voltage is 16000V = 16000 J/C, why is multiplying the max voltage by the max charge (3.2 e-7 C) incorrect?
 

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  • #2
The energy contained is U = 1/2*C*V^2
 
  • #3
EngineerHead said:
why is multiplying the max voltage by the max charge (3.2 e-7 C) incorrect?
Because were you to start drawing off charge, the capacitor voltage would drop, so you don't have available that amount of charge at the max charged voltage.
 

Related to Capacitor separated by a dielectric

1. What is a capacitor?

A capacitor is a passive electronic component that stores and releases electrical energy. It is made of two conducting plates separated by a non-conducting material called a dielectric.

2. What is a dielectric?

A dielectric is a non-conducting material that is placed between the two plates of a capacitor. It is used to separate the plates and prevent current from flowing between them.

3. How does a capacitor separated by a dielectric work?

When a voltage is applied across the plates of a capacitor, it creates an electric field in the dielectric material. This causes the positive and negative charges on the plates to attract each other, storing energy in the form of an electric field.

4. What are some common types of dielectric materials used in capacitors?

Some common dielectric materials used in capacitors include ceramic, paper, mica, and plastic. The choice of dielectric material depends on the specific application and desired capacitance and voltage ratings.

5. What are the benefits of using a capacitor separated by a dielectric?

Capacitors separated by a dielectric have the ability to store and release electrical energy quickly, making them useful in a variety of electronic applications. They also have high capacitance and low resistance, making them efficient at storing and transferring energy.

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