What is the standard voltage for most residential electrical systems in the United States?

Most residential electrical systems in the United States operate at a standard voltage of 120 volts. This voltage is typically used for general household electrical needs, such as lighting, outlets for small appliances, and electronic devices. The 120-volt system is designed to remain safe for everyday use while being sufficient to power the majority of common household items.

In addition, many homes are equipped with a split-phase system that includes both 120 volts and 240 volts. The 240-volt supply is primarily utilized for heavier appliances like dryers, ovens, and air conditioning units, but 120 volts remains the standard for typical household electricity needs. This foundational understanding is essential for anyone working in the electrical field, as it informs everything from wiring practices to the selection of appropriate equipment.