Red Seal Industrial Electrician Practice Exam

A transformer is an essential device in power systems primarily used to change the voltage level of alternating current (AC) electricity. This function is crucial for efficient transmission and distribution of electrical power over long distances. When electricity is generated at a power station, it is typically at a relatively low voltage. To minimize energy loss during transmission, transformers increase the voltage to a much higher level, allowing power to travel long distances with reduced current, which lessens resistive losses. Once the electricity reaches its destination, another transformer is used to decrease the voltage to a safe level for use in homes and businesses. This process of stepping up and stepping down voltage is fundamental to the operation of electrical grids, ensuring that low-voltage, high-current power can be safely utilized while maximizing efficiency during transmission. While transformers do not convert electrical energy into mechanical energy, store electrical energy, or measure current flow in circuits, their primary purpose is specifically related to voltage modification, making them pivotal in the electrical infrastructure.