1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
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: A circuit analysis problem

  1. Oct 8, 2005 #1
    PROBLEM:the current at the terminals of a certain current source is measured with an ammeter having an internal resistance [tex]R_i=10 ohms[/tex] and is found to be [tex]11.988 mA[/tex] ;adding a [tex]1.2 kilo -ohms[/tex] resistance between the source terminals causes the ammeter reading to drop to [tex]11.889 mA[/tex].Find [tex]i_s[/tex] and [tex]R_s[/tex]

    NOTE:[tex]i_s[/tex] and [tex]R_s[/tex] constitute a practical current source.i.e [tex]R_s[/tex] is the internalresistance of the source [tex]i_s[/tex]
     
  2. jcsd
  3. Jul 6, 2017 #2

    scottdave

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2017 Award

    For a practical current source, the internal resistance should be shown as a resistor parallel to the "ideal" current source.
     
  4. Jul 6, 2017 #3

    berkeman

    User Avatar

    Staff: Mentor

    Misplaced homework thread closed for Moderation...
     
  5. Jul 6, 2017 #4

    berkeman

    User Avatar

    Staff: Mentor

    Oh duh, this is a way old problem that got put in the Open Practice Problems forum. Dave, I don't think the OP is going to read our replies...
     
  6. Jul 7, 2017 #5

    scottdave

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2017 Award

    Ha, I just realized what the date was on that.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted