Tue March 23, 2010 By: Garima Singh

about centre tap transformer.

Expert Reply
Sat March 27, 2010

Dear student,

The center tap is simply another wire which is typically connected somewhere in the middle of the secondary coil.  For example, suppose you
had a transformer with 120VAC primary (2wires) and a 24VAC secondary (2 Wires at each end of the secondary coil). If you placed a center tap on
the coil, using the center tap and either end you would get 12 VAC if the center tap is truly in the center. This concept is used in
electronics to generate positive and negative voltages using the center tap as the ground.
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