What is the standard voltage for most residential electrical systems in the U.S.?

The standard voltage for most residential electrical systems in the United States is commonly 120/240 volts. This configuration allows for the use of both voltages within a home. The 120-volt supply is typically used for lighting, small appliances, and general household outlets, while the 240-volt supply is utilized for larger appliances such as ovens, dryers, and air conditioning systems.

By having both 120 and 240 volts available, homes are efficiently equipped to manage various electrical demands. This dual voltage system is a cornerstone of residential wiring, as it provides versatility and ensures that a wide range of electrical devices and appliances can function correctly and safely.

In contrast, the other options represent either a single voltage level which wouldn't account for the comprehensive needs of a residential space or voltages that are not standard for residential settings in the U.S. Overall, the 120/240 volts standard is essential for the design and functionality of modern electrical systems in homes.