What is the normal number of AC cycles per second in the United States?

In the United States, the standard frequency for alternating current (AC) is 60 cycles per second, often referred to as hertz (Hz). This means that the AC voltage changes direction 60 times in one second. This frequency is established by the National Electrical Manufacturers Association and is widely used across a range of applications, including residential, commercial, and industrial power systems.

The adoption of this frequency facilitates the efficient use of electrical equipment and power distribution systems. It is also noteworthy that different regions of the world use varying frequencies; for example, many European countries operate on a frequency of 50 Hz. Understanding the standard frequency is critical for anyone working with electrical systems, as using equipment designed for a different frequency can lead to operational inefficiencies or equipment failure.