What is the typical frequency of AC power in North America?

In North America, the standard frequency for alternating current (AC) power is 60 Hz. This frequency is established for the majority of residential and commercial electrical systems, making it vital for the synchronization of electrical devices and the efficient operation of electrical infrastructure.

The preference for 60 Hz over other frequencies, such as 50 Hz, is largely historical and was influenced by early electrical engineering practices and decisions made by power companies. This frequency provides a good balance between efficiency and performance for the generation and distribution of electricity.

While 50 Hz is common in many countries around the world, particularly in Europe, the choice of 60 Hz helps ensure compatibility with electrical appliances and systems designed for this frequency within the North American context. The other frequencies mentioned, like 120 Hz and 400 Hz, are not standard for general residential use; 400 Hz is typically used in specialized applications, such as aviation and some military equipment, due to the benefits of higher-frequency operation in certain scenarios.