What is the most widely used apparatus in the electric utility industry?

• A. Transformer
• B. Generator
• C. Circuit Breaker
• D. Switch

Answer: (A)

Voltage transformation is essential for moving electrical energy efficiently from generation to end use, and transformers are the devices that do this job throughout nearly every part of the power grid. They raise voltage for long-distance transmission to keep line losses low, and then lower voltage again for distribution and safe use by homes and businesses. Because this voltage-changing function is needed at multiple points across the system—from generation stations to substations to local feeders—transformers appear in vast numbers. Generators are crucial, but there are far fewer of them than transformers. Circuit breakers and switches are common protective and control devices, but their quantities are still far smaller than the number of transformers in a typical utility network. So, transformers are the most widely used apparatus in the electric utility industry.