What is the main purpose of a transformer in electrical systems?

The main purpose of a transformer in electrical systems is to convert voltage levels. Transformers are essential components that allow for the efficient transmission and distribution of electrical energy. By stepping up or stepping down voltage levels, transformers facilitate the transfer of electricity over long distances, minimizing energy losses that occur due to resistance in conductors.

When alternating current (AC) passes through the primary winding of a transformer, it creates a magnetic field that induces a voltage in the secondary winding. This process allows for different voltage levels to be utilized effectively, depending on the requirements of various devices and systems. In this way, transformers play a crucial role in electrical grids by ensuring that electricity is delivered at suitable voltages for both transmission and consumption.

The other options describe functions that do not align with the primary role of transformers. For instance, generating electricity is performed by generators, while storing electrical energy typically involves batteries or capacitors. Additionally, creating direct current is not a function of transformers, as they primarily operate with alternating current.