Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Amplification factor

  1. Oct 16, 2010 #1
    1. The problem statement, all variables and given/known data

    What is amplification factor?

    In case you need to know the context to answer this question, I'll post the homework problem here
    a) Plate characteristics for the 6J5 vacuum-tube are shown in ___ http://img301.imageshack.us/f/6j5loadline60klu9.png/
    Find the plate current in the triode shown here
    (btw this isn't my picture, I just googled it, but it seems very similar to the one I had on the problem)
    b) Find the amplification factor of the tube under the conditions in part a)


    I'll post the picture later if needed,. It's a triode vacuume tube with battery on the left side of 8v making counterclockwise current
    and on the right side,
    there is an resistor with 25k Ohms, and 350v battery making counterclockwise current as well
    (if it's not enough information, let me know)

    answer for part a) is 5.6mA under 210 Potential different (it does not have to be exact, but an estimate)
    I have no problems for part a
    answer for part b) approx: 20
    2. Relevant equations
    Load line equation: E-IR = 350(volts)-I*25000(Ohms)


    3. The attempt at a solution
    I don't know what amplification factor is o.o





    edit: nvm just got it.
    it was
    (let u be mu)
    u= delta V(b) / delta V
     
    Last edited: Oct 16, 2010
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?