measuring current and voltage

Discussion in 'General Electronics Chat' started by Dhwl325, Feb 8, 2007.

  1. Dhwl325

    Thread Starter New Member

    Feb 8, 2007
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    what is the difference between the two
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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    Hi,

    May I suggest you read the relevant section in Volume I of the E-book on this site? There's a good explanation in it.
     
  3. RAH1379

    Well-Known Member

    Dec 13, 2005
    69
    1
    voltage is pressure and current is flow of electrons
     
  4. m4yh3m

    Senior Member

    Apr 28, 2004
    186
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    The unit of electric charge, the coulomb, is defined in terms of the ampere: one coulomb is the amount of electric charge (formerly quantity of electricity) carried in a current of one ampere flowing for one second.[3] Current, then, is the rate at which charge flows through a wire or surface. One ampere of current (I) is equal to a flow of one coulomb of charge (Q) per second of time (t).

    Since a coulomb is approximately equal to 6.24150948×1018 elementary charges, one ampere is approximately equivalent to 6.24150948×1018 elementary charges, such as electrons, moving past a boundary in one second.

    (Ripped from Wiki)
     
  5. Dave

    Retired Moderator

    Nov 17, 2003
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    6.24150948×1018 elementary charges would probably be more than all the electrons in the known universe! It should read 6.24150948×10^18 ;)

    Dave

    Edit: Ignore this nonsense about more than all the electrons in the known universe, the second bit still applies.
     
  6. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    Errmmm, Dave... 10^18>>>>>>>1018.
     
  7. Dave

    Retired Moderator

    Nov 17, 2003
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    Lol! My stupidity!! 6.24150948×1018 ~ 6354, which is very few electrons! I made the bludder interpretting the exponential notation as 6.24150948 e+1018.

    I will leave my boob up for all to see!

    Dave
     
  8. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    Yeah, I figured that's what you did. :D
     
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