In electrical power systems, what is the standard frequency used in the United States?

In electrical power systems, what is the standard frequency used in the United States?

• A. 50 cycles per second (50 Hz)
• B. 400 cycles per second (400 Hz)
• C. 60 cycles per second (60 Hz)
• D. 120 cycles per second (120 Hz)

Answer: (C)

60 cycles per second (60 Hz) is the standard frequency for the United States power grid. The system is designed and operated to maintain this frequency so generators stay synchronized and equipment engineered for US power runs reliably. Frequency stability reflects the balance between generation and load; when demand changes, governors adjust generator speed to keep the frequency around 60 Hz. Other regions use different standards, such as 50 Hz, and aircraft systems often use 400 Hz, but in the US the grid operates at 60 Hz.

60 cycles per second (60 Hz) is the standard frequency for the United States power grid. The system is designed and operated to maintain this frequency so generators stay synchronized and equipment engineered for US power runs reliably. Frequency stability reflects the balance between generation and load; when demand changes, governors adjust generator speed to keep the frequency around 60 Hz. Other regions use different standards, such as 50 Hz, and aircraft systems often use 400 Hz, but in the US the grid operates at 60 Hz.