What is the voltage level of a standard household outlet in the U.S.?

A standard household outlet in the United States typically operates at a voltage level of 120 volts. This voltage is often used to power most household appliances, lighting fixtures, and electronic devices. The reason for this specific voltage level is largely historical, as the electrical infrastructure and equipment were designed around this standard to ensure safety and compatibility across various devices.

While there are other voltage levels used in different applications—such as 240 volts for larger appliances like dryers and ovens—the 120-volt standard is predominantly what you find in general household outlets. This provides a safe and efficient power source for many everyday items while being suitable for the electrical systems typically found in residential settings.