What is the standard frequency for alternating current in North America?

The standard frequency for alternating current (AC) in North America is 60 Hz. This means that the current cycles 60 times per second. This frequency is established and regulated for electrical systems to ensure compatibility and efficiency in a wide range of applications, including residential, commercial, and industrial settings. Standardizing the frequency helps in maintaining a balanced load across the power grid and facilitates the design of electrical devices and appliances that can operate reliably without interference.

The selection of 60 Hz as opposed to other frequencies reflects historical decisions made during the development of electrical power systems, where it was found to be a good compromise between transmission efficiency and the performance of electrical equipment. Other frequencies, such as 50 Hz (used in many parts of the world) or higher frequencies like 70 Hz or 80 Hz, are less common in power distribution systems and are generally not suitable for standard residential and commercial use in North America.