What is the purpose of a transformer regarding voltage levels?

The purpose of a transformer primarily revolves around its ability to convert high voltage to low voltage (or vice versa). This function is crucial in electrical systems, as it allows for the efficient transmission of electricity over long distances. High voltage transmission is employed to minimize energy loss due to resistance in the wires; however, the voltage needs to be reduced for safe usage in homes and businesses.

Transformers facilitate this transition by employing electromagnetic induction to transfer electrical energy between circuits while adjusting the voltage levels according to the needs of the system. This makes them integral in power distribution networks, where they help ensure that electricity reaches consumers at usable voltages without significant losses.

The other options do not accurately describe the transformer's role. For instance, while transformers do work with current, they do not directly regulate it; rather, they change the voltage which indirectly affects the current according to Ohm's Law. Additionally, transformers do not store energy; they transfer it. Finally, although transformers are involved in power distribution, their primary function is not to distribute power evenly but rather to adjust voltage levels for safe and efficient power delivery.