The transformer core is the heart of the transformer. It is composed of many laminated metal sheets that are stacked together. The transformer core allows the transformer to change the voltage of an electrical current.
The transformer core is wrapped in a material called insulation. The insulation helps to keep the transformer core from shorting out. The insulation also helps to keep the transformer core from rusting.
The transformer core is held together by bolts and screws. The transformer core is also stored in place by the weight of the transformer. The transformer core is usually made of iron or steel.