A transformer transforms

Answer: Option C

A transformer is an electrical device that primarily transforms voltage from one level to another. Here's how it works:

Voltage transformation:
The main function of a transformer is to change the voltage level of an alternating current (AC). By using electromagnetic induction, it increases (steps up) or decreases (steps down) the voltage.

Current and power:
While a transformer changes the voltage, it indirectly affects the current. The power in a transformer is conserved (neglecting losses), meaning the power on the primary side is approximately equal to the power on the secondary side, assuming ideal conditions. However, the transformer does not transform power directly but maintains it, adjusted for the changes in voltage and current.

Frequency:
The frequency of the electrical signal remains constant through the transformer. It is not affected by the transformation process. In summary, a transformer primarily transforms voltage while maintaining the same frequency and indirectly affecting current and power.