What is the typical residential voltage in the United States?

What is the typical residential voltage in the United States?

• A. 120/240 volts nominal providing 120 V for outlets and 240 V for some appliances.
• B. 110/220 volts nominal providing 110 V for outlets and 220 V for some appliances.
• C. 240/480 volts nominal.
• D. 230/400 volts nominal.

Answer: (A)

Residential power in the United States is provided as a split-phase service that gives two hot legs and a neutral. Each hot leg is about 120 volts relative to neutral, which powers standard outlets and lighting. The voltage between the two hot legs is about 240 volts, used for higher‑power appliances like ovens, dryers, and some HVAC equipment. So the typical residential voltages are 120 V for normal circuits and 240 V for certain appliances, with the system operating at 60 Hz. The other voltage pairings describe setups in different regions or contexts: 110/220 is an older naming convention that's largely been superseded by 120/240 in US homes; 240/480 is characteristic of industrial or three‑phase high‑voltage systems; 230/400 is common in Europe and many other parts of the world.

Residential power in the United States is provided as a split-phase service that gives two hot legs and a neutral. Each hot leg is about 120 volts relative to neutral, which powers standard outlets and lighting. The voltage between the two hot legs is about 240 volts, used for higher‑power appliances like ovens, dryers, and some HVAC equipment. So the typical residential voltages are 120 V for normal circuits and 240 V for certain appliances, with the system operating at 60 Hz.

The other voltage pairings describe setups in different regions or contexts: 110/220 is an older naming convention that's largely been superseded by 120/240 in US homes; 240/480 is characteristic of industrial or three‑phase high‑voltage systems; 230/400 is common in Europe and many other parts of the world.