Transformer winding polarity

Discussion in 'General Electronics Chat' started by rajeev.thayleveedu, May 26, 2008.

  1. rajeev.thayleveedu

    Thread Starter New Member

    May 26, 2008
    With respect to centre tap one end of the secondary terminal is positive and the other terminal is negative . Why or How?
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    Do not hijack an existing thread. Always start a new one when you have a new question.

    The AAC Ebook section on transformers - - should answer your question. Since the transformer is an AC device, I am sure you realize that the polarity changes with each cycle.
  3. Externet

    AAC Fanatic!

    Nov 29, 2005
    Connect two plain 1,5V cells in series:


    Connect your voltmeter black lead to the junction point CT which is the center tap.
    Probe each cell opposite end with the voltmeter red probe. One will be positive and the other negative with respect to the center tap.

    On a transformer, same polarity difference shows but alternating many times per second.