The image shows an electrical transformer, viewed from the front, a static electrical device that transfers electricity from one primary circuit to a secondary one, while transforming the voltage of the electric current so as to adapt from the secondary circuit to the final consumer.
It consists of a square frame called the iron core of the transformer, rendered by an embossed square, blank in the middle.
On the left side of the core are wrapped around it the conductors, copper wires called primary winding, through which flows initially the primary alternating current, which may be of a certain primary voltage.
On the right side of the core are wrapped around it the conductors, the copper wires called secondary winding, through which flows the secondary current, which may be of a certain secondary voltage.
The high or low voltage is given by the number of windings of copper conductors on the sides of the transformer core.
So, changing the ratio of coils changes how much the voltage changes.
If there are twice as many secondary coils, meaning the secondary winding on the right side, then the voltage is twice as high on the secondary side.
The process can also be reversed, respectively the secondary current flowing through the right side with less secondary winding, than the primary one on the right, to be transformed into low secondary voltage current.
The winding is highlighted, left and right of the core, by thick curved lines.
The direction of current flow, influenced by the magnetic flux of the magnet in the core of the transformer, is from left to right, being illustrated by two arrows with the tip to the right, located in the upper left and right ends.