Electrical Inspection, Testing and Certification Practice Exam 2025 – Comprehensive All-in-One Guide for Exam Success!

A transformer is an essential device in electrical systems primarily used to change the voltage level for transmission. It operates on the principle of electromagnetic induction and enables the efficient transfer of electrical energy between circuits through varying voltage levels. By stepping up voltage levels for transmission, transformers help reduce energy losses over long distances, as higher voltages result in lower currents, mitigating resistive losses in conductors.

Transformers are crucial for adapting voltage levels to meet specific requirements for various applications, ensuring safe and effective distribution of electricity throughout the grid. In residential and commercial settings, they also lower voltage levels to the safe operating levels that can be used by electrical appliances.

While generating electricity, enhancing battery performance, and controlling frequency are important concepts in electrical systems, they do not accurately reflect the primary purpose of a transformer. Transformers specifically focus on voltage manipulation, making option C the correct choice.