Notices
Results 1 to 10 of 10
Like Tree1Likes
  • 1 Post By Strange

Thread: speed of current

  1. #1 speed of current 
    Forum Freshman
    Join Date
    Oct 2012
    Posts
    37
    current is the flow of electron,then it must have speed!
    can any one tell what is the speed of current?


    Reply With Quote  
     

  2.  
     

  3. #2  
    Brassica oleracea Strange's Avatar
    Join Date
    Oct 2011
    Location
    喫茶店
    Posts
    16,679
    It is typically about 3/4 of the speed of light. It varies slightly depending on the material, temperature, voltage and other factors.


    sabari raja likes this.
    Without wishing to overstate my case, everything in the observable universe definitely has its origins in Northamptonshire -- Alan Moore
    Reply With Quote  
     

  4. #3  
    Forum Freshman
    Join Date
    Oct 2012
    Posts
    37
    i studied that current can travel at a lightspeed in gold and 95% of light speed in copper,it is true or not?
    Reply With Quote  
     

  5. #4  
    Forum Freshman
    Join Date
    Oct 2012
    Posts
    37
    And thanks for replying for my all question @strange
    Reply With Quote  
     

  6. #5  
    Brassica oleracea Strange's Avatar
    Join Date
    Oct 2011
    Location
    喫茶店
    Posts
    16,679
    I have no idea! But it sounds wrong. It certainly can't travel at lightspeed in any material.
    Without wishing to overstate my case, everything in the observable universe definitely has its origins in Northamptonshire -- Alan Moore
    Reply With Quote  
     

  7. #6  
    Forum Freshman
    Join Date
    Oct 2012
    Posts
    37
    is there any other thing that can trevel faster than light
    Reply With Quote  
     

  8. #7  
    Suspended
    Join Date
    Apr 2007
    Location
    Pennsylvania
    Posts
    8,795
    The speed of the electrons in the wire is surprisingly slow.

    Drift velocity - Wikipedia, the free encyclopedia
    Reply With Quote  
     

  9. #8  
    Brassica oleracea Strange's Avatar
    Join Date
    Oct 2011
    Location
    喫茶店
    Posts
    16,679
    Quote Originally Posted by sabari raja View Post
    is there any other thing that can trevel faster than light
    Nothing can travel faster than light.
    Without wishing to overstate my case, everything in the observable universe definitely has its origins in Northamptonshire -- Alan Moore
    Reply With Quote  
     

  10. #9  
    Forum Freshman
    Join Date
    Feb 2013
    Posts
    16
    The actual velocity of a single electron is very slow & it does not travel very far. ( in AC current it just moves back & forth) You can picture it as the balls on a billiards table. When you hit the first ball in a long line of balls it hits the 2nd ball which hits the 3rd ball etc. Very quickly the last ball is moved even though none of the balls travelled very far. This is what happens in current flow as the electrons jump from one atom to another. One atom is hit by an electron & it immediately ejects an electron which moves to the next atom and so on. I remember (vaguely) in EL-101 calculating the actual velocity & distance moved by an electron. It was a function of current flow, conductor material, and cross sectional area of the conductor.
    Reply With Quote  
     

  11. #10  
    Forum Professor river_rat's Avatar
    Join Date
    Jun 2006
    Location
    South Africa
    Posts
    1,510
    Yep, each electron drifts really slowly - how ever the message to start drifting moves down the wire at around 2/3 c.
    As is often the case with technical subjects we are presented with an unfortunate choice: an explanation that is accurate but incomprehensible, or comprehensible but wrong.
    Reply With Quote  
     

Similar Threads

  1. current war
    By sabari raja in forum General Discussion
    Replies: 4
    Last Post: October 28th, 2012, 07:18 AM
  2. Is it the speed of light the max speed
    By MadeinRo in forum Physics
    Replies: 17
    Last Post: August 14th, 2011, 07:00 PM
  3. Current and Electromagnets
    By beryllium-nitrogen in forum Electrical and Electronics
    Replies: 4
    Last Post: August 7th, 2009, 06:21 PM
  4. CURRENT QUESTIONS ?
    By BARCUD in forum Physics
    Replies: 5
    Last Post: December 19th, 2008, 10:57 AM
  5. current
    By dejawolf in forum Physics
    Replies: 4
    Last Post: July 6th, 2007, 04:14 AM
Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •