What type of electrical component is used to enhance the efficiency of a transformer?

A core serves as a critical component that enhances the efficiency of a transformer. In transformers, the core is typically made of ferromagnetic materials, which provide a low reluctance path for magnetic flux. This design allows the transformer to effectively transfer energy between the primary and secondary windings through electromagnetic induction.

By concentrating and guiding the magnetic field created by the alternating current in the primary coil, the core minimizes energy losses that occur through dispersion of the magnetic field. This leads to increased coupling between the windings, enhancing overall efficiency. Additionally, an optimized core design can help reduce hysteresis and eddy current losses, further contributing to the transformer's effectiveness during operation.

While other components like inductors and capacitors have their own roles in electrical circuits, they do not specifically function to enhance the efficiency of transformers in the way that an effective core does. Resistors, on the other hand, are used to limit current or dissipate power and would generally reduce efficiency rather than increase it.