Circle with a e around..

Discussion in 'Homework Help' started by snowfox, Oct 21, 2007.

  1. snowfox

    Thread Starter Member

    Oct 21, 2007
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    i kno this sounds silly, but in a circuit.. wat does a circle with a e inside represent? wat kind of source is it?
     
  2. Dave

    Retired Moderator

    Nov 17, 2003
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    I know the guys in the US use E instead of V when referring to voltage. A circle with a V in it is the symbol for a voltmeter, so could this be a different symbol for a voltmeter?

    Dave
     
  3. snowfox

    Thread Starter Member

    Oct 21, 2007
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    In the past we always used a V for a voltage source... but my professor posted this circuit as one of our homeworks...

    The section of this problem im trying to do:

    Set up a simulation in PSpice to simulate the step response.


    So i look at the symbol and was all confused cause i never actually seen it.

    I posted a picture of the circuit we had to recreate... maybe it will help if you have a visual.


    Yea, I'm from the USA.. we have some wierd conventions so i wouldn't even be surprised if that was the case.
     
  4. Dave

    Retired Moderator

    Nov 17, 2003
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    That's just a DC voltage source. Indeed the V has been substituted for an E.

    Dave
     
  5. snowfox

    Thread Starter Member

    Oct 21, 2007
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    lol... thanks a bunch dave, i just wanted to clarify these little things.. I don't know why the professor would just throw us a curveball like tat and change his conventions...
     
  6. beenthere

    Retired Moderator

    Apr 20, 2004
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    Wait until you get some professor bringing in some equipment to fix and you discover that not only do you have to read the manual in German, but the Germans use slightly different symbology as well.
     
  7. Dave

    Retired Moderator

    Nov 17, 2003
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    No problems. Good luck with the rest of your assignment.

    Lol! Funny you should say that, I have recently received literature for work we are supposed to be doing for a company in Austria - all in German! I see the occasion diagram I recognise but at the minute I'm not even sure I'm the right guy for the job!

    Dave
     
  8. recca02

    Senior Member

    Apr 2, 2007
    1,211
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    :D
    its all your fault,
    you started the elf puzzle.

    about the above dia i think there shud not have been a 'e' inside the circle,
    and atleast it shud have been a capital 'E'. that was what caused the confusion.
    and if its a DC source its much better to draw the ol' symbol for battery.
     
  9. Distort10n

    Active Member

    Dec 25, 2006
    429
    1
    Really? I was taught to use V as the symbol for voltage. E I always presumed was electromotive force, which is the same as voltage. Is there any place where one MUST be used instead of the other?
     
  10. recca02

    Senior Member

    Apr 2, 2007
    1,211
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    I was taught,
    E = EMF-sometimes back EMF
    V= terminal voltage,
    but apart from transformers and motors havent used it both at the same time.
     
  11. Dave

    Retired Moderator

    Nov 17, 2003
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    Lol! Is that what they call karma?!

    In the UK, we very rarely use E at all. For example when Ohm's Law or power equations are quoted we always use V, whereas other sources (of which the e-book on this site is an example), they use E ref. http://www.allaboutcircuits.com/vol_5/chpt_1/1.html

    There is a small discussion on this in the Ohm's Law section in Volume I:

    ref. http://www.allaboutcircuits.com/vol_1/chpt_2/1.html

    Although this is not a rule, it is a good standard to work to. Personally I avoid E altogether.

    Dave
     
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