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: What does it mean variable Direct Current ?

  1. Feb 26, 2012 #1
    what does it mean "variable Direct Current"?

    I am confused on the point where i see the word variable DC in a question(see attachment). If a DC vary like a curve then in some cases it can be like AC.
    How is it varying
    (Don't tell me answers.)
     

    Attached Files:

  2. jcsd
  3. Feb 26, 2012 #2

    SammyS

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    Re: what does it mean "variable Direct Current"?

    attachment.php?attachmentid=44417&d=1330285199.png
    The DC voltage source is not varying , it's variable .

    You apply a DC voltage at some value, and measure V1, V2 and I.

    Then, change the DC voltage to a different value, and measure V1, V2 and I.

       
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook