Transformer Characteristics

Discussion in 'General Electronics Chat' started by USNtron75, Nov 24, 2011.

  1. USNtron75

    Thread Starter New Member

    Dec 14, 2010
    If you will, consider a 120 VAC power transformer that steps down to 12 VAC with a center-tapped secondary winding. Now, I understand why there's 12 VAC at each of the outside lines, but why is is the voltage cut in half on the ceter line? Does the coil impede (build pressure) the voltage, thereby cutting it in half at the center line? Ultimately, what determines the available voltage on the secondary side? Is it the ratio between the primary and secondary sides? Thank You!!

    Einstein said, " I just want to learn to think like God. Everything else is details. "

    Tron 75
  2. SgtWookie


    Jul 17, 2007
    DING! DING! DING! We have a winner! :)

    It is the ratio of turns from the primary to the secondary side.

    If you have a 120v primary and a split 12v secondary, then the primary has 100 turns to the secondary's 5 for each side of the center tap.
  3. Yako

    New Member

    Nov 24, 2011
    Don't forget to tell them about eddy loss current. How does the voltage magically transfer between the windings too?