What is the function of a transformer?

The function of a transformer is primarily to change the voltage level in an electrical system. Transformers operate based on the principle of electromagnetic induction and are designed to either step up (increase) or step down (decrease) voltage levels while maintaining the power in the system.

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. By adjusting the number of turns in the primary and secondary coils, a transformer can effectively modify the voltage level. This capability is crucial in electrical distribution systems, where power generated at high voltages is often transmitted over long distances and then reduced to a lower voltage suitable for use in homes or businesses.

Other options, such as converting DC to AC power or measuring electrical current, do not pertain to the fundamental function of a transformer. Additionally, while transformers can be used in systems designed to provide a stable voltage level, their primary purpose revolves around the manipulation of voltage rather than supplying a constant voltage. Therefore, the essence of a transformer's functionality lies in its ability to change voltage levels in an electrical system.