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

The standard voltage for most residential electrical systems in the United States is 120 volts. This voltage is typically used for general household appliances such as lights, outlets, and small electronics. The use of 120 volts is standardized to ensure compatibility with appliances and devices designed for the US market, facilitating safe and efficient operation.

The residential electrical system often includes 240 volts for certain larger appliances, such as dryers, ovens, and HVAC systems, which require more power. However, the standard outlets that most homeowners use daily operate at the 120-volt level. Understanding this standard is crucial for safe electrical work and ensuring that appliances are used with the correct voltage supply.