Jump to content
Danijel Gorupec

Odd capacitor questions

Recommended Posts

Hi,

 

If you have a simple capacitor made of two identical metal plates. After you put a charge on it...

 

1. does the negative plate becomes any heavier (greater mass) than the positive one? (For the difference in number of electrons inside. Or am I missing some other effects.)

 

2. does the negative plate becomes any warmer (higher temperature) than the positive one? (Because I imagine electrons as a 'gas' inside metal -> 'pressure' is reduced on the positive plate, and increased on the negative.)

 

Thanks.

Share this post


Link to post
Share on other sites

Hi,

 

If you have a simple capacitor made of two identical metal plates. After you put a charge on it...

 

1. does the negative plate becomes any heavier (greater mass) than the positive one? (For the difference in number of electrons inside. Or am I missing some other effects.)

 

2. does the negative plate becomes any warmer (higher temperature) than the positive one? (Because I imagine electrons as a 'gas' inside metal -> 'pressure' is reduced on the positive plate, and increased on the negative.)

 

Thanks.

 

 

1. Yes, though this is a small amount. The positive side will have lost some electrons, and the negative side will have gained them.

 

2. There will be some resistive heating as the capacitor charges. I'm not sure of any other effects, and after it is charged the system will tend to cool to ambient temperature.

Share this post


Link to post
Share on other sites

Thanks Swansont. I am aware of resistive heating. Still I was thinking if there is any temperature effect from 'stuffing more electrons inside' - as it would be when you stuff more gas into a container (adiabatic heating).

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.