What is the standard frequency of alternating current in the United States?

The standard frequency of alternating current (AC) in the United States is 60 Hz. This means that the current alternates direction 60 times per second. The adoption of this frequency is largely due to historical factors, including the development of electrical infrastructure and the compatibility of equipment designed to operate efficiently at this rate.

Using 60 Hz allows for a balance between efficient power transmission and acceptable performance in appliances and machinery. While some countries, mostly in Europe and parts of Asia, use a frequency of 50 Hz, the 60 Hz standard in the U.S. is crucial for ensuring that electrical devices, including motors, generators, and other equipment, function reliably. Understanding this frequency is important for anyone working with or studying electrical systems in the U.S., as many electrical devices and systems are designed specifically to operate at this frequency.