What is the primary role of a transformer in an electrical circuit?

The primary role of a transformer in an electrical circuit is to convert voltage levels. Transformers are electrical devices that utilize electromagnetic induction to change the voltage of alternating current (AC) in a circuit. They can either increase (step-up) or decrease (step-down) voltage based on the turns ratio of their coils.

This conversion is crucial for the efficient transmission and distribution of electricity over long distances, as higher voltages allow for lower current levels, which minimizes resistive losses in the wires. When the electrical energy reaches its destination, transformers can further adjust the voltage to suitable levels for various applications and end-users.

While other options represent aspects related to electricity and circuits, they do not accurately describe the fundamental function of a transformer. Transformers do not generate power, store energy, or directly measure current flow, which distinguishes their primary role within electrical systems.