Transformer windings are another important part of the transformer structure because they are the main current-carrying conductors wound on the laminated part of the core. As shown in the figure, in a single-phase two-winding transformer, there will be two windings. The one that is connected to the voltage source and generates magnetic flux is called the primary winding, and the second winding is called the secondary winding. The result of mutual inductance is the induced voltage. If the secondary output voltage is less than the primary input voltage, the transformer is called a "step-down transformer". If the secondary output voltage is greater than the primary input voltage, it is called a "boost transformer". The type of wire used as the main current-carrying conductor in the transformer winding is copper or aluminum. Although aluminum wire is lighter and generally cheaper than copper wire, it must use a larger conductor cross-sectional area to carry the sam...