Which of the following is NOT a function of a transformer?

A transformer is an electrical device primarily used to change the voltage level in an alternating current (AC) electrical circuit. Its fundamental functions include increasing voltage, which allows electricity to be transmitted over long distances with minimal losses, and decreasing voltage, which is necessary for bringing high-voltage electricity down to usable levels for residential or commercial applications. Additionally, changing voltage levels is crucial for matching the voltage requirements of various devices and systems.

However, transformers do not store energy. Instead, they transfer energy from one circuit to another through electromagnetic induction. The process involves the input of energy at one voltage level, which is then converted to a different voltage level while maintaining the overall energy balance, but this energy is not held or stored within the transformer itself. Therefore, identifying "storing energy" as a function that does not apply to transformers is accurate.