Questions for Independent Current Source

Discussion in 'General Electronics Chat' started by jproject, May 12, 2011.

  1. jproject

    Thread Starter New Member

    May 12, 2011
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    0
    Hello everyone,

    I've been learning some basic circuits as a first year electrical engineer student and I have some questions regarding independent current sources.

    First question:
    What are some examples of independent current sources? I'm having trouble imagining a current source that does not change at all when its voltage changes.

    Second question:
    If the independent current source is pointing to the right but the voltage sign on the current source is positive at left and negative at right like this...

    + -
    -->

    is it absorbing energy or supplying energy? My thought was absorbing energy using the sign convention method since the current is flowing to the right at the rate of whatever the independent current value is and the exiting side has a negative sign which means it absorbs (like resistors). But, my Irwin book says independent current sources will always "supply" current at the certain amount it is set to no matter what the voltage is (so a vertical slope on a voltage vs current graph). So, I thought I would ask you guys.


    Thank you!
     
  2. Jony130

    AAC Fanatic!

    Feb 17, 2009
    3,957
    1,097
    In real life the "current sources" does not exist.
    The current source is a theoretical device.
    But we can make a "device" which will behave (in limited range) just like a current source.
    http://sound.westhost.com/ism.htm#p1

    I agree with Irwin book opinion, the Independent current sources will always "supply" current at the certain amount it is set to no matter what the voltage is across the current source.
     
  3. jproject

    Thread Starter New Member

    May 12, 2011
    17
    0
    Darn, I wanted to see what happens if I put a battery with an independent current source in series (explosion? I hope?). Oh well.

    Thanks for the reply!
     
  4. Jony130

    AAC Fanatic!

    Feb 17, 2009
    3,957
    1,097
    No think will explode.
    Simply, the voltage across the current source will be equal the battery.
    And the current that is drawn from the battery is equal the current source current.
     
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