What is a transformer used for?

A transformer is primarily used to change the voltage level in an electrical system. This function is crucial in power distribution and transmission, allowing electricity to be stepped up to a higher voltage for efficient long-distance travel, which reduces energy loss due to resistance in the wires. Once the electricity reaches its destination, transformers can then step down the voltage to a safer, more usable level for consumers.

While monitoring electrical flow, connecting different systems, and regulating battery power are important functionalities in electrical systems, they are not the primary role of a transformer. Its unique ability to alter voltage levels is fundamental to how electrical power is transmitted and utilized in various applications, making it an essential component in the infrastructure of electrical systems.