Previous in Forum: What Tests Should Aspiring Engineers Know About?   Next in Forum: elcb
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
5 comments
Rate Comments: Nested
Anonymous Poster

How to calculate the current density of the conductive material?

06/12/2009 9:53 PM

I try to calculate the current density as mentioned on above.

As,

Current density = electrical conductivity X electric field strenght

I only have the data of electric conductivity but electric field strenght. Does any way or method can find out of this?
Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
Anonymous Poster
#1

Re: How to calculate the current density of the conductive material?

06/14/2009 6:49 PM

I seem to remember that the E field is the gradient of the potential... Of course you will need far more than this for the current density as current density also depends on the frequency. At higher frequencies the current is confined to the surface of the conductor (google skin effect)
Reply
Sleepy
Power-User
Engineering Fields - Systems Engineering - Member for some time now, see my profile.

Join Date: Aug 2007
Location: Essex, UK
Posts: 364
Good Answers: 3
#2

Re: How to calculate the current density of the conductive material?

06/15/2009 4:40 AM

Guest,

I am not clear as to what you wish to achieve.

Normally, current density (DC or Frequency low enough for skin effect to be ignored) would equate to current flow divided by the cross sectional arae of the conductor.

Sleepy
Reply
Electron Oasis
Commentator
United States - Member - Les Etats Unis

Join Date: May 2007
Location: Sacramento, California
Posts: 61
#3

Re: How to calculate the current density of the conductive material?

06/17/2009 1:54 PM

Guest,

Perhaps this link will help you out.

__________________
 No trees or ecological systems were harmed in the creation or transmission of this message. However, a large number of electrons were horribly inconvenienced.
Reply
Electron Oasis
Commentator
United States - Member - Les Etats Unis

Join Date: May 2007
Location: Sacramento, California
Posts: 61
#4
In reply to #3

Re: How to calculate the current density of the conductive material?

06/17/2009 2:10 PM

and Wiki.

__________________
 No trees or ecological systems were harmed in the creation or transmission of this message. However, a large number of electrons were horribly inconvenienced.
Reply
Anonymous Poster
#5

Re: How to calculate the current density of the conductive material?

06/18/2009 10:27 PM

Maybe I make it simple.

e.g.

the cross sectional area of 400A cable is 180mm2, can I calculate the current density by 400A / 180mm2 = 2.22mm2 ?

Besides, could anyone proivde the list of acceptable current density of different rating of conductor? the rating of conductor is 100A, 200A, 400A, 600A, 800A ..........
Reply
Reply to Forum Thread
Have a Different Question?
5 comments
Copy to Clipboard

Users who posted comments:

Anonymous Poster (2); Electron Oasis (2); Sleepy (1)

Previous in Forum: What Tests Should Aspiring Engineers Know About?   Next in Forum: elcb

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Engineering Careers:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (64 right now)
Show Members
Advertisement