The Symbol " Q "

Discussion in 'Energy & Fuel' started by Hal Pollner, Feb 13, 2020.

  1. Hal Pollner

    Hal Pollner Very Well-Known Member
    Registered

    Joined:
    Feb 11, 2018
    Messages:
    3,934
    Likes Received:
    3,109
    (Only Fred, Faye, and possibly 1 or 2 others on this Forum beside myself understand what the electrical symbol "Q" means.)

    "Q" is the "Figure of Merit" of the Quality of an Inductor or Coil.

    It is given by the ratio of Inductive Reactance to the Resistance of the Inductor in question, at a specified frequency.

    Thus, an Inductor with a Reactance (XL) of 1200 Ohms and a Resistance (R) of 5 Ohms has a "Q" of 240 at that frequency.

    "Q" is determined by the formula XL divided by R, where XL is from the formula: XL=2piFL. or 2 pi times the Frequency "F" in Hz by the Inductance "L" in Henries.

    That's all...

    Hal
     
    #1
    Frank Sanoica likes this.
  2. Frank Sanoica

    Frank Sanoica Veteran Member
    Registered

    Joined:
    Feb 21, 2016
    Messages:
    8,130
    Likes Received:
    8,498
    @Hal Pollner

    We had an old guy teaching A/C theory at DeVry Technical Institute long ago, likable, very knowledgable, comical. He came up with an unusual representation involving Q, Xl, and R which stated "Fo / Q". He said think of it as ....."Foe - Q".
    Frank
     
    #2
  3. Thomas Stearn

    Thomas Stearn Very Well-Known Member
    Registered

    Joined:
    Apr 21, 2018
    Messages:
    1,326
    Likes Received:
    1,843
    You seem to know the inside out. ;) Just wanna say that I'm not one of those.
     
    #3
    Frank Sanoica likes this.
  4. Hal Pollner

    Hal Pollner Very Well-Known Member
    Registered

    Joined:
    Feb 11, 2018
    Messages:
    3,934
    Likes Received:
    3,109
    Ahhhhh yes, Thomas.....but your skills and talents are found in many other areas, I'm sure!

    Hal;)
     
    #4
  5. Thomas Stearn

    Thomas Stearn Very Well-Known Member
    Registered

    Joined:
    Apr 21, 2018
    Messages:
    1,326
    Likes Received:
    1,843
    Well, it should have been “know them...“ of course.:rolleyes:
    Must keep looking...
     
    #5
    Frank Sanoica likes this.

Share This Page