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

Homework Help: Which Graph is which

  1. Sep 15, 2018 #1
    1. The problem statement, all variables and given/known data
    (1) Name the waveform(s) that represent a periodical current flow.

    (2) Name the waveform(s) that represent a direct current.

    (3) Name the waveform(s) that represent a non-periodical alternating current.

    (4) Name the waveform(s) that represent a current with a non-positive average

    Each letter can be used more than once or not at all. I find some graphs to be very tricky and confusing. For example, graph A looks like a direct current graph but it goes below the 0 line a little, causing me to doubt it. Graph E and G are very weird graphs for me as well.

    2. Relevant equations
    No calculations required. Question only requires me to choose which graph fits which description.

    3. The attempt at a solution
    My answers: 1) C, A, D
    2) D, F
    3) B, E, G
    4) E
     

    Attached Files:

  2. jcsd
  3. Sep 15, 2018 #2

    SammyS

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    Hello, @jaximus . Welcome to PF.

    You did well to use the "UPLOAD" feature for your image.
    I find it helpful for the full image to be shown in the post rather than just showing the thumbnail image, but other helpers may disagree with me.

    As for your answers, I agree with all but 4), which should have one additional selection.
     
  4. Sep 15, 2018 #3
    Alright, I'll keep that in mind. Thank you for the advice SammyS.
     
  5. Sep 15, 2018 #4

    SammyS

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    OK.

    As for answer 4.

    If an average is zero, then it is non-negative, right?
     
  6. Sep 15, 2018 #5
    Ah yes, it should be. Then number 4 will include graph C since it has an average of 0. Thank you for the lead.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted