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Section 2 Installation
metal core. When an alternating current is sent
through the fi rst coil, the primary, it magnetizes
the metal core, Figure 10-29, causing surges
of magnetic fl ux. These surges are constantly
reversing directions. This magnetic fl ux also
moves through the other coil, which is called the
secondary. A current is created there, too. Since
the same magnetic fl ux exists throughout the
core, the same voltage per wire turn is created.
Therefore, any voltage difference is the direct
result of differences in the number of turns in
the primary and secondary windings.
Figure 10-28. Transformers have a simple makeup. They consist of a metal core with windings or turns of wire
around opposite sides. Note schematic at right.