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!

DC Generator: Equations & Graphs

  1. Jul 25, 2012 #1
    Hello everyone,

    I found on this website http://spiff.rit.edu/classes/phys213/lectures/lenz/lenz_long.html a very good explanation for AC generators. Particularly I am considering these two images:

    And attachment.php?attachmentid=49308&stc=1&d=1343211095.jpg

    I found those equations and graphs are quite interesting and wish to make a "change" so that they are valid for DC generators.

    My thinking is that: For the sine graph, I have to flip the negative part to make it positive. It will look something like this:

    Also, the equations for magnetic flux, the current and also the voltage basically stay the same but should be taken as the absolute value.

    Can anyone please correct me if I wrong?

    Many thanks,

    Attached Files:

    Last edited: Jul 25, 2012
  2. jcsd
  3. Jul 25, 2012 #2
    You are on the right track. The main difference between an AC and a DC generator is the means of making connections to the coil.
    In an AC machine 'Slip rings' are used to preserve the AC voltage and current. In a DC machine a 'commutator' is used to make the voltage and current in one direction, just as you have drawn in your last diagram.
  4. Jul 26, 2012 #3
    Thank you very much truesearch!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook