What voltage and frequency does the United States typically use for electrical systems?

The correct voltage and frequency used in the United States for standard electrical systems is 120VAC at 60Hz. This specification is significant because it standardizes the operation of electrical appliances and ensures compatibility across residential and commercial systems.

In the U.S., the 120-volt system is commonly used for general household outlets, allowing for safe and efficient use of most residential electrical devices. The frequency of 60 Hz is also crucial, as it affects the performance of electric motors and various appliances. This standard is established by the National Electrical Manufacturers Association (NEMA) and has become the norm across American electrical infrastructure.

The other voltage and frequency options listed do not pertain to the typical standard in the United States. For example, 240VAC is more commonly found in specific applications such as dryers and larger appliances, but it's not the standard household voltage. Frequencies of 50Hz are more common in various regions around the globe but not in the U.S., and voltages like 110VAC and 220VAC, while they might be encountered in some contexts, do not represent the standard used in American electrical systems today. Thus, the established figure of 120VAC at 60Hz is key for understanding the norm in U.S. electrical