1. Not finding help here? Sign up for a free 30min 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!

Confused on amperes in primary & secondary circuits

  1. Apr 1, 2010 #1
    1. The problem statement, all variables and given/known data

    A transformer has 500 turns in its primary coil and 4000 turns in its secondary. (a) What will be the voltage in the secondary if the primary voltage is 110? (b) If 5 amperes flow through the secondary circuit of the transformer, what will the current in the primary be? (c) If there are 8 amperes in the secondary, how many are there in the primary?

    I'm a little confused on whether I'm inverting the equation correctly on parts b and c - can someone let me know if this is the formula they use?
    2. Relevant equations



    3. The attempt at a solution

    v2/v1=n2/n1 So V2/110=4000/500 = 880V

    b.)Ip/Is=Ns/Np = Ip/5 = 4000/500 = 40 A

    c.)Ip/Is=Ns/Np = Ip/8 = 4000/500 = 64 A
     
  2. jcsd
  3. Apr 1, 2010 #2

    berkeman

    User Avatar

    Staff: Mentor

    Looks correct to me.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook