What function does a transformer serve in an electrical circuit?

A transformer plays a critical role in electrical circuits by increasing or decreasing voltage levels. It does this through the principle of electromagnetic induction, involving coils of wire (windings) around a core that transfers electrical energy between circuits at different voltage levels. This function is essential for efficiently transmitting electricity over long distances, as higher voltages reduce energy loss due to resistance in the wires.

Transformers are vital in power distribution systems, as they allow the adjustment of voltages to suitable levels for various applications, ensuring that end-users receive electricity at a safe and usable voltage. Understanding this function is key for linemen, as it relates directly to the safe and efficient handling of electrical systems.

The other options do not align with the primary function of a transformer. While storing electricity, regulating data flow, and providing insulation are important aspects of electrical systems, they do not pertain to what a transformer specifically does.