What frequency does the United States grid use for AC power?

What frequency does the United States grid use for AC power?

• A. 60 Hz
• B. 50 Hz
• C. 120 Hz
• D. 30 Hz

Answer: (A)

The frequency of the United States electrical grid is 60 Hz, meaning the voltage oscillates 60 times per second. This standard underpins the synchronization of generators, stability of the transmission network, and the design of motors and transformers used throughout the system. It also aligns with common household voltage of around 120 V RMS, so equipment and control systems are built to operate reliably at both 60 Hz and that voltage level. 50 Hz is typical in many other regions, while 120 Hz is not the grid frequency (it’s what you get as the ripple frequency when you rectify 60 Hz AC), and 30 Hz is not used for grid power.

The frequency of the United States electrical grid is 60 Hz, meaning the voltage oscillates 60 times per second. This standard underpins the synchronization of generators, stability of the transmission network, and the design of motors and transformers used throughout the system. It also aligns with common household voltage of around 120 V RMS, so equipment and control systems are built to operate reliably at both 60 Hz and that voltage level.

50 Hz is typical in many other regions, while 120 Hz is not the grid frequency (it’s what you get as the ripple frequency when you rectify 60 Hz AC), and 30 Hz is not used for grid power.