Do my notes make sense?

Discussion in 'Homework Help' started by Gdrumm, Apr 4, 2009.

  1. Gdrumm

    Thread Starter Distinguished Member

    Aug 29, 2008
    684
    36
    I'm an old dog, trying to learn new tricks, and I'm just not getting it.
    I did good in the DC Circuits class, but I'm struggling in AC.

    Our professor gave us some look alike questions to help us study for an upcoming test. I wrote so quickly, I can't make out my notes very well.

    Please take a look and see if you can point me in the right direction.
    Let me know if my notes make sense...

    Thanks,
    Gary
    1. Amplitude Pk @ 400Mv AC
    A. Volts AC / .707?
    2. P-P A of 700 mV RMS 1.98 V
    A. RMS/.707 = P x 2 = P-P?
    3. RMS 345 mV AC
    A. RMS/.707?
    4. Pk 100 mV
    A. 100 mV/.7.0?
    5. Avg 10V/.707x.637= 9.01V
    6. P-P .900V
    A. .9/.707 =x2 = 2.55v
    7. e-inst =sin x pk
    8. 45 deg elec points... sin RMS voltage?
    9. 135 deg elec points .707
    10. e-inst @45 deg diff - slope
    elec % pt at 135 deg
    11. 45 deg & 225% diff
    12. 40 Pk sin 24 V e inst
    13. T of 1 cycle 466 mA
    14. 350NS 2.86M 6?
    15. F=300 K Hz =3.33 micro S?
    16. 666 cyles in 1 Sin in 1 Second 1.5M minus 1.5 micro?

    There are a lot more, but they are similar to these.
    If I can solve these, I should be able to solve the others as well.
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Last edited: Apr 4, 2009
  3. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
    6,357
    718
    V_{\small RMS}=V_{\small Peak \sim} \cdot \sqrt{2}

    \sqrt{2} \approx 1.414

    V_{\small Peak \sim} = \fra{V_{\small RMS}}{\sqrt {2}}

    \frac {1}{\sqrt{2}} \approx 0.707

    \lambda = \frac {1}{f} = Wavelength

    V_\phi = V_{\small Peak \sim} \cdot \sin(\theta)

    Those are the correct formulas that I could decipher and are part of many of the questions.

    -ETA: These are for sinewaves only, hence the \sim. ≈ Means "Close To" or Approximation
     
    Last edited: Apr 4, 2009
Loading...