What is the primary reason for using transformers in electrical power systems?

Using transformers in electrical power systems primarily serves the function of minimizing power loss during transmission. This is accomplished through the ability of transformers to adjust voltage levels, allowing electricity to be transmitted over long distances more efficiently. When power is transmitted at a higher voltage, the current is reduced, which in turn decreases the resistive losses (which are proportional to the square of the current) that occur in the transmission lines.

By using transformers to step up the voltage for transmission and then step it down for distribution to consumers, the system optimizes both the efficiency and integrity of power delivery. This design is crucial for modern electrical grids, as it allows electricity generated from power plants to be transported over vast distances while maintaining minimal energy losses.

While other options hint at important aspects of electrical systems—like regulating current flow or increasing current capacity—they do not capture the primary role of transformers in reducing transmission losses, which is essential for operating power systems effectively and economically.