Connect with us

Stupid qestion

Discussion in 'Electrical Engineering' started by Chugga Chug, Mar 2, 2007.

Scroll to continue with content
  1. Chugga Chug

    Chugga Chug Guest

    In this room I have a socket on the wall marked "230 V AC", but there is
    nothing plugged in.

    If there is no load, then there is no current flow from the socket. If there
    can only be current flow into a load, then does this mean that I nolonger
    have AC (alternating current)?

    So why do we say AC, when we really mean AV? Just a thought!
     
  2. Tim Gard

    Tim Gard Guest

    Even without load, the voltage continues to oscillate while the current is
    zero. You are of coarse correct from my point of view. But logic and science
    seldom go hand in hand, unfortunately! But, if you look at the device in
    its working state rather than its idle, and useless, then the current
    alternates. Ok. I'll give em that ...

    Tim Gard
     
  3. TimPerry

    TimPerry Guest

    from this point it just word games :) your AC is potentially there

    current is the movement of electrons (or holes if you prefer)

    voltage is derived from current.


    AV means audio/visual

    VA means volt-amps or veterans administration or Virginia
     
  4. Guest

    |> In this room I have a socket on the wall marked "230 V AC", but there is
    |> nothing plugged in.
    |>
    |> If there is no load, then there is no current flow from the socket. If there
    |> can only be current flow into a load, then does this mean that I no longer
    |> have AC (alternating current)?
    |>
    |> So why do we say AC, when we really mean AV? Just a thought!
    |
    | I can attempt to at least partially answer your question even without
    | my morning cup of coffee. :)
    | There is still voltage at those contacts even though nothing is
    | plugged into it, i.e. just because
    | your widget isn't plugged in doesn't mean the whole grid just shut
    | down obviously. :) So there
    | is still alternating voltage, as you indicate, you're just not tapping
    | into it. Therefore, there is
    | no current flowing, and thus no "alternating current".

    Actually, there is alternating current flowing. How much depends on how
    far the wire runs. There's only voltage at the end, but there is current
    along the wires. It's called "charging current".
     
  5. Ben Miller

    Ben Miller Guest

    Actually there is voltage all along the wires also.

    Ben Miller
     
  6. Harry Darkas

    Harry Darkas Guest

    Interesting response to a relatively meaningless question. Many thanks to
    you and all who have given their opinion. I shall refrain from asking if the
    generating company are not cheating me by selling me the same electrons,
    over and over again ;-)

    CC
     
  7. Harry Darkas

    Harry Darkas Guest

    There is absolutely no reason why abbreviations cannot be re-used again and
    again. Take for example AA. This is a battery form designation, but it also
    means:

    Amino Acid
    Anti-Aircraft
    Alcoholics Anonymous
    Automobile Association
    American Airlines
    Arabian Acoustics

    Even the BBC would be horrified to read my dictionary of abbreviations. It
    also lists the "Belfast Boat Club"!
     
  8. TimPerry

    TimPerry Guest

    sure there is, accurate communication is needed. when the same sounds or
    abbreviations have different meanings within a related field coherent
    communication ceases.
     
  9. Don Kelly

    Don Kelly Guest

    ---------
    You are right in but you have to go back into history to determine how AC vs
    AV came about. Possibly it was because one can more easily measure current
    than voltage (most analog voltmeters are based on mechanical deflection due
    to a current through the meter). In any case it is likely that noone now
    alive knows why AC/DC was used in place of AV/DV. It is locked into the
    vocabulary to such an extent that there is no point in getting a hairy about
    it as that simply leads to more confusion. We have enough of that with
    "conventional" vs "electron" current or worse yet: "induced current" which,
    strictly speaking, doesn't exist but is commonly and erroneously used .


    It is easy to be logical with 100+ years of hindsight- but then it is too
    late. --

    Don Kelly
    remove the X to answer
    ----------------------------
     
  10. b_foote

    b_foote Guest

    ----- Original Message -----
    From: "Don Kelly" <>
    Newsgroups: alt.engineering.electrical
    Sent: Saturday, March 03, 2007 10:42 PM
    Subject: Re: Stupid qestion

    back in those days, they were still working with static electricity, like
    high voltages built up on amber rubbed rapidly with wool, etc, and chemical
    batteries....
    Batteries, have a "current" when connected in a complete loop from battery
    back to battery... a loop thru which there was a "current"... so maybe
    conceptually they thought more in terms of "current" than voltages that
    were sometimes "static", some times "steady", like "direct", and sometimes,
    the new fangled, "alternating".... which had some confounding advantage, for
    changing voltages and reducing losses due to currents in wires with
    resistances....
    Maybe simple... needing a closed circuit for the current to flow thru.. New
    Jersey, usa
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-